diff --git a/packages/browser/src/eventbuilder.ts b/packages/browser/src/eventbuilder.ts
index 4db58b9b7b43..8084cd63b9d1 100644
--- a/packages/browser/src/eventbuilder.ts
+++ b/packages/browser/src/eventbuilder.ts
@@ -22,7 +22,8 @@ export function exceptionFromError(stackParser: StackParser, ex: Error): Excepti
   const frames = parseStackFrames(stackParser, ex);
 
   const exception: Exception = {
-    type: ex && ex.name,
+    // This is necessary in order to get the name of user-defined errors which subclass `Error`
+    type: ex && ex.constructor.name,
     value: extractMessage(ex),
   };
 
diff --git a/packages/browser/test/unit/eventbuilder.test.ts b/packages/browser/test/unit/eventbuilder.test.ts
index ac9b564e99e0..524e683a444a 100644
--- a/packages/browser/test/unit/eventbuilder.test.ts
+++ b/packages/browser/test/unit/eventbuilder.test.ts
@@ -1,7 +1,7 @@
 import type { Client } from '@sentry/types';
 
 import { defaultStackParser } from '../../src';
-import { eventFromPlainObject } from '../../src/eventbuilder';
+import { eventFromPlainObject, exceptionFromError } from '../../src/eventbuilder';
 
 jest.mock('@sentry/core', () => {
   const original = jest.requireActual('@sentry/core');
@@ -62,3 +62,25 @@ describe('eventFromPlainObject', () => {
     });
   });
 });
+
+describe('exceptionFromError ', () => {
+  it('correctly reads error type and value from built-in `Error` subclass', () => {
+    const exceptionJSON = exceptionFromError(() => [], new TypeError("Expected type 'ChewToy', got type 'Shoe'"));
+
+    expect(exceptionJSON).toEqual({
+      type: 'TypeError',
+      value: "Expected type 'ChewToy', got type 'Shoe'",
+    });
+  });
+
+  it('correctly reads error type and value from user-defined `Error` subclass', () => {
+    class DidNotFetch extends Error {}
+
+    const exceptionJSON = exceptionFromError(() => [], new DidNotFetch("Failed to fetch requested object: 'ball'"));
+
+    expect(exceptionJSON).toEqual({
+      type: 'DidNotFetch',
+      value: "Failed to fetch requested object: 'ball'",
+    });
+  });
+});
diff --git a/packages/browser/test/unit/helper/error-object.ts b/packages/browser/test/unit/helper/error-object.ts
new file mode 100644
index 000000000000..1716a82f8717
--- /dev/null
+++ b/packages/browser/test/unit/helper/error-object.ts
@@ -0,0 +1,6 @@
+// Convert an Error-like object into something TS recognizes as an `Error`, getting around read-only properties
+export function makeMockError(obj: { [key: string]: any; message: string; name: string; stack?: string }): Error {
+  const anyObj = obj as any;
+  anyObj.constructor = { name: obj.name };
+  return anyObj as Error;
+}
diff --git a/packages/browser/test/unit/tracekit/chromium.test.ts b/packages/browser/test/unit/tracekit/chromium.test.ts
index 56b5844711e7..906e773f3885 100644
--- a/packages/browser/test/unit/tracekit/chromium.test.ts
+++ b/packages/browser/test/unit/tracekit/chromium.test.ts
@@ -1,10 +1,11 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - Chrome Tests', () => {
   it('should parse Chrome error with no location', () => {
     const NO_LOCATION = { message: 'foo', name: 'bar', stack: 'error\n at Array.forEach (native)' };
-    const ex = exceptionFromError(parser, NO_LOCATION);
+    const ex = exceptionFromError(parser, makeMockError(NO_LOCATION));
 
     expect(ex).toEqual({
       value: 'foo',
@@ -26,7 +27,7 @@ describe('Tracekit - Chrome Tests', () => {
         '    at http://path/to/file.js:24:4',
     };
 
-    const ex = exceptionFromError(parser, CHROME_15);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_15));
 
     expect(ex).toEqual({
       value: "Object #<Object> has no method 'undef'",
@@ -53,7 +54,7 @@ describe('Tracekit - Chrome Tests', () => {
         '    at I.e.fn.(anonymous function) [as index] (http://localhost:8080/file.js:10:3651)',
     };
 
-    const ex = exceptionFromError(parser, CHROME_36);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_36));
 
     expect(ex).toEqual({
       value: 'Default error',
@@ -99,7 +100,7 @@ describe('Tracekit - Chrome Tests', () => {
         '   at TESTTESTTEST.proxiedMethod(webpack:///./~/react-proxy/modules/createPrototypeProxy.js?:44:30)',
     };
 
-    const ex = exceptionFromError(parser, CHROME_XX_WEBPACK);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_XX_WEBPACK));
 
     expect(ex).toEqual({
       value: "Cannot read property 'error' of undefined",
@@ -152,7 +153,7 @@ describe('Tracekit - Chrome Tests', () => {
         'at http://localhost:8080/file.js:31:13\n',
     };
 
-    const ex = exceptionFromError(parser, CHROME_48_EVAL);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_48_EVAL));
 
     expect(ex).toEqual({
       value: 'message string',
@@ -184,7 +185,7 @@ describe('Tracekit - Chrome Tests', () => {
         '    at n.handle (blob:http%3A//localhost%3A8080/abfc40e9-4742-44ed-9dcd-af8f99a29379:7:2863)',
     };
 
-    const ex = exceptionFromError(parser, CHROME_48_BLOB);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_48_BLOB));
 
     expect(ex).toEqual({
       value: 'Error: test',
@@ -247,7 +248,7 @@ describe('Tracekit - Chrome Tests', () => {
             at examplescheme://examplehost/cd351f7250857e22ceaa.worker.js:70179:15`,
     };
 
-    const ex = exceptionFromError(parser, CHROMIUM_EMBEDDED_FRAMEWORK_CUSTOM_SCHEME);
+    const ex = exceptionFromError(parser, makeMockError(CHROMIUM_EMBEDDED_FRAMEWORK_CUSTOM_SCHEME));
 
     expect(ex).toEqual({
       value: 'message string',
@@ -277,7 +278,7 @@ describe('Tracekit - Chrome Tests', () => {
           at http://localhost:5000/test:24:7`,
     };
 
-    const ex = exceptionFromError(parser, CHROME73_NATIVE_CODE_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(CHROME73_NATIVE_CODE_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'test',
@@ -310,7 +311,7 @@ describe('Tracekit - Chrome Tests', () => {
           at http://localhost:5000/:50:19`,
     };
 
-    const ex = exceptionFromError(parser, CHROME73_EVAL_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(CHROME73_EVAL_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'bad',
@@ -342,7 +343,7 @@ describe('Tracekit - Chrome Tests', () => {
           at test (http://localhost:5000/:33:23)`,
     };
 
-    const ex = exceptionFromError(parser, CHROME_109_ASYNC_URL);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_109_ASYNC_URL));
 
     expect(ex).toEqual({
       value: 'bad',
@@ -368,7 +369,7 @@ describe('Tracekit - Chrome Tests', () => {
             at Global code (http://localhost:5000/test:24:7)`,
     };
 
-    const ex = exceptionFromError(parser, EDGE44_NATIVE_CODE_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(EDGE44_NATIVE_CODE_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'test',
@@ -401,7 +402,7 @@ describe('Tracekit - Chrome Tests', () => {
             at Anonymous function (http://localhost:5000/:50:8)`,
     };
 
-    const ex = exceptionFromError(parser, EDGE44_EVAL_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(EDGE44_EVAL_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'aha',
@@ -437,7 +438,7 @@ describe('Tracekit - Chrome Tests', () => {
             at TESTTESTTEST.someMethod (C:\\Users\\user\\path\\to\\file.js:295:108)`,
     };
 
-    const ex = exceptionFromError(parser, CHROME_ELECTRON_RENDERER);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_ELECTRON_RENDERER));
 
     expect(ex).toEqual({
       value: "Cannot read property 'error' of undefined",
@@ -469,7 +470,7 @@ describe('Tracekit - Chrome Tests', () => {
       at commitLayoutEffects (react-dom.development.js?f8c1:23426:1)`,
     };
 
-    const ex = exceptionFromError(parser, EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(EXCEPTION));
 
     expect(ex).toEqual({
       value: 'aha',
@@ -535,7 +536,7 @@ describe('Tracekit - Chrome Tests', () => {
         at Array.reduce(<anonymous>)`,
     };
 
-    const ex = exceptionFromError(parser, EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(EXCEPTION));
 
     expect(ex).toEqual({
       value: 'aha',
@@ -582,7 +583,7 @@ describe('Tracekit - Chrome Tests', () => {
           at more (http://localhost:5000/(some)/(thing)/index.html:25:7)`,
     };
 
-    const ex = exceptionFromError(parser, CHROME_BRACES_URL);
+    const ex = exceptionFromError(parser, makeMockError(CHROME_BRACES_URL));
 
     expect(ex).toEqual({
       value: 'bad',
@@ -620,7 +621,7 @@ describe('Tracekit - Chrome Tests', () => {
           at http://localhost:5000/:50:19`,
     };
 
-    const ex = exceptionFromError(parser, LONG_FRAME);
+    const ex = exceptionFromError(parser, makeMockError(LONG_FRAME));
 
     expect(ex).toEqual({
       value: 'bad',
diff --git a/packages/browser/test/unit/tracekit/firefox.test.ts b/packages/browser/test/unit/tracekit/firefox.test.ts
index f75dd7ccf010..30db06fa0a8b 100644
--- a/packages/browser/test/unit/tracekit/firefox.test.ts
+++ b/packages/browser/test/unit/tracekit/firefox.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - Firefox Tests', () => {
   it('should parse Firefox 3 error', () => {
@@ -19,7 +20,7 @@ describe('Tracekit - Firefox Tests', () => {
         '',
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_3);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_3));
 
     expect(ex).toEqual({
       value: 'this.undef is not a function',
@@ -55,7 +56,7 @@ describe('Tracekit - Firefox Tests', () => {
         '',
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_7);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_7));
 
     expect(ex).toEqual({
       value: 'bar',
@@ -87,7 +88,7 @@ describe('Tracekit - Firefox Tests', () => {
       lineNumber: 48,
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_14);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_14));
 
     expect(ex).toEqual({
       value: 'x is null',
@@ -116,7 +117,7 @@ describe('Tracekit - Firefox Tests', () => {
       columnNumber: 12,
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_31);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_31));
 
     expect(ex).toEqual({
       value: 'Default error',
@@ -151,7 +152,7 @@ describe('Tracekit - Firefox Tests', () => {
       result: 2147500037,
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_44_NS_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_44_NS_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'No error message',
@@ -186,7 +187,7 @@ describe('Tracekit - Firefox Tests', () => {
       name: 'TypeError',
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_50_RESOURCE_URL);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_50_RESOURCE_URL));
 
     expect(ex).toEqual({
       value: 'this.props.raw[this.state.dataSource].rows is undefined',
@@ -234,7 +235,7 @@ describe('Tracekit - Firefox Tests', () => {
         '@http://localhost:8080/file.js:33:9',
     };
 
-    const ex = exceptionFromError(parser, FIREFOX_43_EVAL);
+    const ex = exceptionFromError(parser, makeMockError(FIREFOX_43_EVAL));
 
     expect(ex).toEqual({
       value: 'message string',
@@ -260,7 +261,7 @@ describe('Tracekit - Firefox Tests', () => {
           @http://localhost:5000/test:24:7`,
     };
 
-    const stacktrace = exceptionFromError(parser, FIREFOX66_NATIVE_CODE_EXCEPTION);
+    const stacktrace = exceptionFromError(parser, makeMockError(FIREFOX66_NATIVE_CODE_EXCEPTION));
 
     expect(stacktrace).toEqual({
       value: 'test',
@@ -290,7 +291,7 @@ describe('Tracekit - Firefox Tests', () => {
           @http://localhost:5000/:50:19`,
     };
 
-    const stacktrace = exceptionFromError(parser, FIREFOX66_EVAL_EXCEPTION);
+    const stacktrace = exceptionFromError(parser, makeMockError(FIREFOX66_EVAL_EXCEPTION));
 
     expect(stacktrace).toEqual({
       value: 'aha',
@@ -324,7 +325,7 @@ describe('Tracekit - Firefox Tests', () => {
       name: 'TypeError',
     };
 
-    const stacktrace = exceptionFromError(parser, FIREFOX_FILE_IN_IDENTIFIER);
+    const stacktrace = exceptionFromError(parser, makeMockError(FIREFOX_FILE_IN_IDENTIFIER));
 
     expect(stacktrace).toEqual({
       stacktrace: {
diff --git a/packages/browser/test/unit/tracekit/ie.test.ts b/packages/browser/test/unit/tracekit/ie.test.ts
index 544542b0dcaf..445f6aad587c 100644
--- a/packages/browser/test/unit/tracekit/ie.test.ts
+++ b/packages/browser/test/unit/tracekit/ie.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - IE Tests', () => {
   it('should parse IE 10 error', () => {
@@ -15,7 +16,7 @@ describe('Tracekit - IE Tests', () => {
       number: -2146823281,
     };
 
-    const ex = exceptionFromError(parser, IE_10);
+    const ex = exceptionFromError(parser, makeMockError(IE_10));
 
     // TODO: func should be normalized
     expect(ex).toEqual({
@@ -44,7 +45,7 @@ describe('Tracekit - IE Tests', () => {
       number: -2146823281,
     };
 
-    const ex = exceptionFromError(parser, IE_11);
+    const ex = exceptionFromError(parser, makeMockError(IE_11));
 
     // TODO: func should be normalized
     expect(ex).toEqual({
@@ -73,7 +74,7 @@ describe('Tracekit - IE Tests', () => {
       number: -2146823279,
     };
 
-    const ex = exceptionFromError(parser, IE_11_EVAL);
+    const ex = exceptionFromError(parser, makeMockError(IE_11_EVAL));
 
     expect(ex).toEqual({
       value: "'getExceptionProps' is undefined",
diff --git a/packages/browser/test/unit/tracekit/misc.test.ts b/packages/browser/test/unit/tracekit/misc.test.ts
index b092c8d10723..31dcd63f964b 100644
--- a/packages/browser/test/unit/tracekit/misc.test.ts
+++ b/packages/browser/test/unit/tracekit/misc.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - Misc Tests', () => {
   it('should parse PhantomJS 1.19 error', () => {
@@ -12,7 +13,7 @@ describe('Tracekit - Misc Tests', () => {
         '    at foo (http://path/to/file.js:4283)\n' +
         '    at http://path/to/file.js:4287',
     };
-    const ex = exceptionFromError(parser, PHANTOMJS_1_19);
+    const ex = exceptionFromError(parser, makeMockError(PHANTOMJS_1_19));
 
     expect(ex).toEqual({
       value: 'bar',
@@ -47,7 +48,7 @@ describe('Tracekit - Misc Tests', () => {
         '   at playTimer.current(./app/components/replays/replayContext.tsx:397:62)\n' +
         '   at sentryWrapped(../node_modules/@sentry/browser/esm/helpers.js:90:17)',
     };
-    const ex = exceptionFromError(parser, SECURITY_ERROR);
+    const ex = exceptionFromError(parser, makeMockError(SECURITY_ERROR));
 
     expect(ex).toEqual({
       type: 'SecurityError',
diff --git a/packages/browser/test/unit/tracekit/opera.test.ts b/packages/browser/test/unit/tracekit/opera.test.ts
index e86855dc172a..f6b4ec6a2d0c 100644
--- a/packages/browser/test/unit/tracekit/opera.test.ts
+++ b/packages/browser/test/unit/tracekit/opera.test.ts
@@ -2,6 +2,7 @@ import { createStackParser } from '@sentry/utils';
 
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser, opera10StackLineParser, opera11StackLineParser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 const operaParser = createStackParser(opera10StackLineParser, opera11StackLineParser);
 const chromiumParser = defaultStackParser;
@@ -30,7 +31,7 @@ describe('Tracekit - Opera Tests', () => {
         '',
     };
 
-    const ex = exceptionFromError(operaParser, OPERA_10);
+    const ex = exceptionFromError(operaParser, makeMockError(OPERA_10));
 
     expect(ex).toEqual({
       value: 'Statement on line 42: Type mismatch (usually non-object value supplied where object required)',
@@ -76,7 +77,7 @@ describe('Tracekit - Opera Tests', () => {
         '    foo();',
     };
 
-    const ex = exceptionFromError(operaParser, OPERA_11);
+    const ex = exceptionFromError(operaParser, makeMockError(OPERA_11));
 
     expect(ex).toEqual({
       value: "'this.undef' is not a function",
@@ -113,7 +114,7 @@ describe('Tracekit - Opera Tests', () => {
         '    dumpException3();',
     };
 
-    const ex = exceptionFromError(operaParser, OPERA_12);
+    const ex = exceptionFromError(operaParser, makeMockError(OPERA_12));
 
     expect(ex).toEqual({
       value: "Cannot convert 'x' to object",
@@ -157,7 +158,7 @@ describe('Tracekit - Opera Tests', () => {
         '    at bar (http://path/to/file.js:108:168)',
     };
 
-    const ex = exceptionFromError(chromiumParser, OPERA_25);
+    const ex = exceptionFromError(chromiumParser, makeMockError(OPERA_25));
 
     expect(ex).toEqual({
       value: "Cannot read property 'undef' of null",
diff --git a/packages/browser/test/unit/tracekit/react-native.test.ts b/packages/browser/test/unit/tracekit/react-native.test.ts
index 9a74e46007b1..89dc026e223d 100644
--- a/packages/browser/test/unit/tracekit/react-native.test.ts
+++ b/packages/browser/test/unit/tracekit/react-native.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - React Native Tests', () => {
   it('should parse exceptions for react-native-v8', () => {
@@ -15,7 +16,7 @@ describe('Tracekit - React Native Tests', () => {
           at Object.y(index.android.bundle:93:571)
           at P(index.android.bundle:93:714)`,
     };
-    const stacktrace = exceptionFromError(parser, REACT_NATIVE_V8_EXCEPTION);
+    const stacktrace = exceptionFromError(parser, makeMockError(REACT_NATIVE_V8_EXCEPTION));
 
     expect(stacktrace).toEqual({
       value: 'Manually triggered crash to test Sentry reporting',
@@ -62,7 +63,7 @@ describe('Tracekit - React Native Tests', () => {
           p@/data/user/0/com.sentrytest/files/.expo-internal/bundle-613EDD44F3305B9D75D4679663900F2BCDDDC326F247CA3202A3A4219FD412D3:96:385
           forEach@[native code]`,
     };
-    const stacktrace = exceptionFromError(parser, REACT_NATIVE_EXPO_EXCEPTION);
+    const stacktrace = exceptionFromError(parser, makeMockError(REACT_NATIVE_EXPO_EXCEPTION));
 
     expect(stacktrace).toEqual({
       value: 'Test Error Expo',
@@ -123,7 +124,7 @@ describe('Tracekit - React Native Tests', () => {
         'at this(/home/username/sample-workspace/sampleapp.collect.react/node_modules/react-native/Libraries/Renderer/src/renderers/native/ReactNativeBaseComponent.js:74:41)\n',
     };
 
-    const ex = exceptionFromError(parser, ANDROID_REACT_NATIVE);
+    const ex = exceptionFromError(parser, makeMockError(ANDROID_REACT_NATIVE));
 
     expect(ex).toEqual({
       value: 'Error: test',
@@ -242,7 +243,7 @@ describe('Tracekit - React Native Tests', () => {
         '[native code]',
     };
 
-    const ex = exceptionFromError(parser, ANDROID_REACT_NATIVE_PROD);
+    const ex = exceptionFromError(parser, makeMockError(ANDROID_REACT_NATIVE_PROD));
 
     expect(ex).toEqual({
       value: 'Error: test',
@@ -353,7 +354,7 @@ describe('Tracekit - React Native Tests', () => {
         'at value (address at index.android.bundle:1:32776)\n' +
         'at value (address at index.android.bundle:1:31561)',
     };
-    const ex = exceptionFromError(parser, ANDROID_REACT_NATIVE_HERMES);
+    const ex = exceptionFromError(parser, makeMockError(ANDROID_REACT_NATIVE_HERMES));
 
     expect(ex).toEqual({
       value: 'Error: lets throw!',
diff --git a/packages/browser/test/unit/tracekit/react.test.ts b/packages/browser/test/unit/tracekit/react.test.ts
index d949a4dee0eb..7a26cd49b073 100644
--- a/packages/browser/test/unit/tracekit/react.test.ts
+++ b/packages/browser/test/unit/tracekit/react.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - React Tests', () => {
   it('should correctly parse Invariant Violation errors and use framesToPop to drop info message', () => {
@@ -15,7 +16,7 @@ describe('Tracekit - React Tests', () => {
           at f (http://localhost:5000/:1:980)`,
     };
 
-    const ex = exceptionFromError(parser, REACT_INVARIANT_VIOLATION_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(REACT_INVARIANT_VIOLATION_EXCEPTION));
 
     expect(ex).toEqual({
       value:
@@ -62,7 +63,7 @@ describe('Tracekit - React Tests', () => {
         at f (http://localhost:5000/:1:980)`,
     };
 
-    const ex = exceptionFromError(parser, REACT_PRODUCTION_ERROR);
+    const ex = exceptionFromError(parser, makeMockError(REACT_PRODUCTION_ERROR));
 
     expect(ex).toEqual({
       value:
@@ -110,7 +111,7 @@ describe('Tracekit - React Tests', () => {
         at f (http://localhost:5000/:1:980)`,
     };
 
-    const ex = exceptionFromError(parser, REACT_PRODUCTION_ERROR);
+    const ex = exceptionFromError(parser, makeMockError(REACT_PRODUCTION_ERROR));
 
     expect(ex).toEqual({
       value:
diff --git a/packages/browser/test/unit/tracekit/safari.test.ts b/packages/browser/test/unit/tracekit/safari.test.ts
index 657ffc7daecc..ad2526db35c5 100644
--- a/packages/browser/test/unit/tracekit/safari.test.ts
+++ b/packages/browser/test/unit/tracekit/safari.test.ts
@@ -1,5 +1,6 @@
 import { exceptionFromError } from '../../../src/eventbuilder';
 import { defaultStackParser as parser } from '../../../src/stack-parsers';
+import { makeMockError } from '../helper/error-object';
 
 describe('Tracekit - Safari Tests', () => {
   it('should parse Safari 6 error', () => {
@@ -15,7 +16,7 @@ describe('Tracekit - Safari Tests', () => {
       sourceURL: 'http://path/to/file.js',
     };
 
-    const stackFrames = exceptionFromError(parser, SAFARI_6);
+    const stackFrames = exceptionFromError(parser, makeMockError(SAFARI_6));
 
     expect(stackFrames).toEqual({
       value: "'null' is not an object (evaluating 'x.undef')",
@@ -41,7 +42,7 @@ describe('Tracekit - Safari Tests', () => {
       sourceURL: 'http://path/to/file.js',
     };
 
-    const stackFrames = exceptionFromError(parser, SAFARI_7);
+    const stackFrames = exceptionFromError(parser, makeMockError(SAFARI_7));
 
     expect(stackFrames).toEqual({
       value: "'null' is not an object (evaluating 'x.undef')",
@@ -67,7 +68,7 @@ describe('Tracekit - Safari Tests', () => {
       sourceURL: 'http://path/to/file.js',
     };
 
-    const stackFrames = exceptionFromError(parser, SAFARI_8);
+    const stackFrames = exceptionFromError(parser, makeMockError(SAFARI_8));
 
     expect(stackFrames).toEqual({
       value: "null is not an object (evaluating 'x.undef')",
@@ -97,7 +98,7 @@ describe('Tracekit - Safari Tests', () => {
       column: 18,
     };
 
-    const stackFrames = exceptionFromError(parser, SAFARI_8_EVAL);
+    const stackFrames = exceptionFromError(parser, makeMockError(SAFARI_8_EVAL));
 
     expect(stackFrames).toEqual({
       value: "Can't find variable: getExceptionProps",
@@ -122,7 +123,7 @@ describe('Tracekit - Safari Tests', () => {
       at safari-extension:(//3284871F-A480-4FFC-8BC4-3F362C752446/2665fee0/topee-content.js:3313:26)`,
       };
 
-      const ex = exceptionFromError(parser, SAFARI_EXTENSION_EXCEPTION);
+      const ex = exceptionFromError(parser, makeMockError(SAFARI_EXTENSION_EXCEPTION));
 
       expect(ex).toEqual({
         value: 'wat',
@@ -156,7 +157,7 @@ describe('Tracekit - Safari Tests', () => {
         safari-extension://com.grammarly.safari.extension.ext2-W8F64X92K3/ee7759dd/Grammarly.js:2:1588410
         promiseReactionJob@[native code]`,
       };
-      const ex = exceptionFromError(parser, SAFARI_EXTENSION_EXCEPTION);
+      const ex = exceptionFromError(parser, makeMockError(SAFARI_EXTENSION_EXCEPTION));
 
       expect(ex).toEqual({
         value: "undefined is not an object (evaluating 'e.groups.includes')",
@@ -192,7 +193,7 @@ describe('Tracekit - Safari Tests', () => {
       at safari-web-extension:(//3284871F-A480-4FFC-8BC4-3F362C752446/2665fee0/topee-content.js:3313:26)`,
       };
 
-      const ex = exceptionFromError(parser, SAFARI_WEB_EXTENSION_EXCEPTION);
+      const ex = exceptionFromError(parser, makeMockError(SAFARI_WEB_EXTENSION_EXCEPTION));
 
       expect(ex).toEqual({
         value: 'wat',
@@ -226,7 +227,7 @@ describe('Tracekit - Safari Tests', () => {
       safari-web-extension://46434E60-F5BD-48A4-80C8-A422C5D16897/scripts/content-script.js:29:56027
       promiseReactionJob@[native code]`,
       };
-      const ex = exceptionFromError(parser, SAFARI_EXTENSION_EXCEPTION);
+      const ex = exceptionFromError(parser, makeMockError(SAFARI_EXTENSION_EXCEPTION));
 
       expect(ex).toEqual({
         value: "undefined is not an object (evaluating 'e.groups.includes')",
@@ -264,7 +265,7 @@ describe('Tracekit - Safari Tests', () => {
           global code@http://localhost:5000/test:24:10`,
     };
 
-    const ex = exceptionFromError(parser, SAFARI12_NATIVE_CODE_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(SAFARI12_NATIVE_CODE_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'test',
@@ -298,7 +299,7 @@ describe('Tracekit - Safari Tests', () => {
           http://localhost:5000/:50:29`,
     };
 
-    const ex = exceptionFromError(parser, SAFARI12_EVAL_EXCEPTION);
+    const ex = exceptionFromError(parser, makeMockError(SAFARI12_EVAL_EXCEPTION));
 
     expect(ex).toEqual({
       value: 'aha',
diff --git a/packages/node/src/eventbuilder.ts b/packages/node/src/eventbuilder.ts
index f2bb1443a40f..2092baf99bec 100644
--- a/packages/node/src/eventbuilder.ts
+++ b/packages/node/src/eventbuilder.ts
@@ -30,7 +30,8 @@ export function parseStackFrames(stackParser: StackParser, error: Error): StackF
  */
 export function exceptionFromError(stackParser: StackParser, error: Error): Exception {
   const exception: Exception = {
-    type: error.name || error.constructor.name,
+    // This is necessary in order to get the name of user-defined errors which subclass `Error`
+    type: error.constructor.name,
     value: error.message,
   };
 
diff --git a/packages/node/test/eventbuilders.test.ts b/packages/node/test/eventbuilders.test.ts
index 46dfc02a3c33..1cea28bf522e 100644
--- a/packages/node/test/eventbuilders.test.ts
+++ b/packages/node/test/eventbuilders.test.ts
@@ -1,7 +1,7 @@
 import type { Client } from '@sentry/types';
 
 import { defaultStackParser, Scope } from '../src';
-import { eventFromUnknownInput } from '../src/eventbuilder';
+import { eventFromUnknownInput, exceptionFromError } from '../src/eventbuilder';
 
 const testScope = new Scope();
 
@@ -74,3 +74,25 @@ describe('eventFromUnknownInput', () => {
     });
   });
 });
+
+describe('exceptionFromError ', () => {
+  it('correctly reads error type and value from built-in `Error` subclass', () => {
+    const exceptionJSON = exceptionFromError(() => [], new TypeError("Expected type 'ChewToy', got type 'Shoe'"));
+
+    expect(exceptionJSON).toEqual({
+      type: 'TypeError',
+      value: "Expected type 'ChewToy', got type 'Shoe'",
+    });
+  });
+
+  it('correctly reads error type and value from user-defined `Error` subclass', () => {
+    class DidNotFetch extends Error {}
+
+    const exceptionJSON = exceptionFromError(() => [], new DidNotFetch("Failed to fetch requested object: 'ball'"));
+
+    expect(exceptionJSON).toEqual({
+      type: 'DidNotFetch',
+      value: "Failed to fetch requested object: 'ball'",
+    });
+  });
+});
diff --git a/packages/react/src/errorboundary.tsx b/packages/react/src/errorboundary.tsx
index 9a01ae110a64..c108ee4b4454 100644
--- a/packages/react/src/errorboundary.tsx
+++ b/packages/react/src/errorboundary.tsx
@@ -125,7 +125,12 @@ class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoundarySta
       // See: https://github.com/getsentry/sentry-javascript/issues/6167
       if (isAtLeastReact17(React.version) && isError(error)) {
         const errorBoundaryError = new Error(error.message);
-        errorBoundaryError.name = `React ErrorBoundary ${errorBoundaryError.name}`;
+        // Once `errorBoundaryError` is constructed, the only thing we need its constructor for is its name. Since the
+        // real constructor's `name` property is read-only, we just replace the entire constructor with an object that
+        // has what we need.
+        errorBoundaryError.constructor = {
+          name: `React ErrorBoundary ${errorBoundaryError.name}`,
+        } as typeof errorBoundaryError.constructor;
         errorBoundaryError.stack = componentStack;
 
         // Using the `LinkedErrors` integration to link the errors together.
diff --git a/packages/react/test/errorboundary.test.tsx b/packages/react/test/errorboundary.test.tsx
index f90aaa04b346..b4da7030195e 100644
--- a/packages/react/test/errorboundary.test.tsx
+++ b/packages/react/test/errorboundary.test.tsx
@@ -247,7 +247,7 @@ describe('ErrorBoundary', () => {
       const error = mockCaptureException.mock.calls[0][0];
       const cause = error.cause;
       expect(cause.stack).toEqual(mockCaptureException.mock.calls[0][1].contexts.react.componentStack);
-      expect(cause.name).toContain('React ErrorBoundary');
+      expect(cause.constructor.name).toContain('React ErrorBoundary');
       expect(cause.message).toEqual(error.message);
     });
 
@@ -339,7 +339,7 @@ describe('ErrorBoundary', () => {
       const firstError = secondError.cause;
       const cause = firstError.cause;
       expect(cause.stack).toEqual(mockCaptureException.mock.calls[0][1].contexts.react.componentStack);
-      expect(cause.name).toContain('React ErrorBoundary');
+      expect(cause.constructor.name).toContain('React ErrorBoundary');
       expect(cause.message).toEqual(thirdError.message);
     });
 
@@ -379,7 +379,7 @@ describe('ErrorBoundary', () => {
       const cause = error.cause;
       // We need to make sure that recursive error.cause does not cause infinite loop
       expect(cause.stack).not.toEqual(mockCaptureException.mock.calls[0][1].contexts.react.componentStack);
-      expect(cause.name).not.toContain('React ErrorBoundary');
+      expect(cause.constructor.name).not.toContain('React ErrorBoundary');
     });
 
     it('calls `beforeCapture()` when an error occurs', () => {