diff --git a/packages/@ember/-internals/metal/lib/mixin.ts b/packages/@ember/-internals/metal/lib/mixin.ts
index b6dce62fc6e..e9c788c4f73 100644
--- a/packages/@ember/-internals/metal/lib/mixin.ts
+++ b/packages/@ember/-internals/metal/lib/mixin.ts
@@ -9,7 +9,6 @@ import {
   getOwnPropertyDescriptors,
   guidFor,
   makeArray,
-  NAME_KEY,
   ROOT,
   setObservers,
   wrap,
@@ -596,7 +595,6 @@ export default class Mixin {
     this._without = undefined;
 
     if (DEBUG) {
-      this[NAME_KEY] = undefined;
       /*
         In debug builds, we seal mixins to help avoid performance pitfalls.
 
@@ -744,7 +742,6 @@ type MixinLike = Mixin | { [key: string]: any };
 Mixin.prototype.toString = classToString;
 
 if (DEBUG) {
-  Mixin.prototype[NAME_KEY] = undefined;
   Object.seal(Mixin.prototype);
 }
 
diff --git a/packages/@ember/-internals/metal/tests/mixin/introspection_test.js b/packages/@ember/-internals/metal/tests/mixin/introspection_test.js
index b3149159a18..83ce11febe1 100644
--- a/packages/@ember/-internals/metal/tests/mixin/introspection_test.js
+++ b/packages/@ember/-internals/metal/tests/mixin/introspection_test.js
@@ -2,7 +2,7 @@
 // as well as methods vs props.  We are just keeping these for testing; the
 // current impl doesn't care about the differences as much...
 
-import { guidFor, NAME_KEY } from '@ember/-internals/utils';
+import { guidFor } from '@ember/-internals/utils';
 import { mixin, Mixin } from '../..';
 import { moduleFor, AbstractTestCase } from 'internal-test-helpers';
 
@@ -58,18 +58,5 @@ moduleFor(
         'should return included mixins'
       );
     }
-
-    ['@test setting a NAME_KEY on a mixin does not error'](assert) {
-      assert.expect(0);
-
-      let instance = Mixin.create();
-      instance[NAME_KEY] = 'My special name!';
-    }
-
-    ['@test setting a NAME_KEY on a mixin instance does not error'](assert) {
-      assert.expect(0);
-
-      Mixin.create({ [NAME_KEY]: 'My special name' });
-    }
   }
 );
diff --git a/packages/@ember/-internals/utils/index.ts b/packages/@ember/-internals/utils/index.ts
index fa851c579cf..f31cf9077ae 100644
--- a/packages/@ember/-internals/utils/index.ts
+++ b/packages/@ember/-internals/utils/index.ts
@@ -38,6 +38,3 @@ export {
   teardownMandatorySetter,
   setWithMandatorySetter,
 } from './lib/mandatory-setter';
-
-import symbol from './lib/symbol';
-export const NAME_KEY = symbol('NAME_KEY');
diff --git a/packages/ember/index.js b/packages/ember/index.js
index ed1c878e7f8..d5e4c913632 100644
--- a/packages/ember/index.js
+++ b/packages/ember/index.js
@@ -195,18 +195,6 @@ Ember.tryInvoke = utils.tryInvoke;
 Ember.wrap = utils.wrap;
 Ember.uuid = utils.uuid;
 
-Object.defineProperty(Ember, 'NAME_KEY', {
-  enumerable: false,
-  get() {
-    deprecate('Using `Ember.NAME_KEY` is deprecated, override `.toString` instead', false, {
-      id: 'ember-name-key-usage',
-      until: '3.9.0',
-    });
-
-    return utils.NAME_KEY;
-  },
-});
-
 // ****@ember/-internals/container****
 Ember.Container = Container;
 Ember.Registry = Registry;
diff --git a/packages/ember/tests/reexports_test.js b/packages/ember/tests/reexports_test.js
index cc34700f0b3..16f8b41daff 100644
--- a/packages/ember/tests/reexports_test.js
+++ b/packages/ember/tests/reexports_test.js
@@ -38,12 +38,6 @@ moduleFor(
       }, /EXTEND_PROTOTYPES is deprecated/);
     }
 
-    ['@test Ember.NAME_KEY is deprecated']() {
-      expectDeprecation(() => {
-        Ember.NAME_KEY;
-      }, 'Using `Ember.NAME_KEY` is deprecated, override `.toString` instead');
-    }
-
     '@test Ember.FEATURES is exported'(assert) {
       for (let feature in FEATURES) {
         assert.equal(