diff --git a/app/models/user.rb b/app/models/user.rb
index 26be197209ac14cb5221a5c52ee4d75a75c64ff1..02637b70f03dde3d85915892f8bbfec9d2c2b145 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1117,9 +1117,10 @@ class User < ApplicationRecord
 
   def ensure_namespace_correct
     if namespace
-      namespace.path = namespace.name = username if username_changed?
+      namespace.path = username if username_changed?
+      namespace.name = name if name_changed?
     else
-      build_namespace(path: username, name: username)
+      build_namespace(path: username, name: name)
     end
   end
 
diff --git a/changelogs/unreleased/bvl-rename-routes-after-user-rename.yml b/changelogs/unreleased/bvl-rename-routes-after-user-rename.yml
new file mode 100644
index 0000000000000000000000000000000000000000..8b0a01dea5385a620cc6fab9e144678ce702edbe
--- /dev/null
+++ b/changelogs/unreleased/bvl-rename-routes-after-user-rename.yml
@@ -0,0 +1,5 @@
+---
+title: Update a user's routes after updating their name
+merge_request: 23272
+author:
+type: fixed
diff --git a/spec/models/concerns/routable_spec.rb b/spec/models/concerns/routable_spec.rb
index 1fb0dd5030ca9baa1ddcc8268260d7c92d614cd2..31163a5bb5c5ae516706f146697f479f9bafaca7 100644
--- a/spec/models/concerns/routable_spec.rb
+++ b/spec/models/concerns/routable_spec.rb
@@ -15,23 +15,46 @@ describe Group, 'Routable' do
   end
 
   describe 'Callbacks' do
-    it 'creates route record on create' do
-      expect(group.route.path).to eq(group.path)
-      expect(group.route.name).to eq(group.name)
-    end
+    context 'for a group' do
+      it 'creates route record on create' do
+        expect(group.route.path).to eq(group.path)
+        expect(group.route.name).to eq(group.name)
+      end
+
+      it 'updates route record on path change' do
+        group.update(path: 'wow', name: 'much')
 
-    it 'updates route record on path change' do
-      group.update(path: 'wow', name: 'much')
+        expect(group.route.path).to eq('wow')
+        expect(group.route.name).to eq('much')
+      end
+
+      it 'ensure route path uniqueness across different objects' do
+        create(:group, parent: group, path: 'xyz')
+        duplicate = build(:project, namespace: group, path: 'xyz')
 
-      expect(group.route.path).to eq('wow')
-      expect(group.route.name).to eq('much')
+        expect { duplicate.save! }.to raise_error(ActiveRecord::RecordInvalid, 'Validation failed: Path has already been taken')
+      end
     end
 
-    it 'ensure route path uniqueness across different objects' do
-      create(:group, parent: group, path: 'xyz')
-      duplicate = build(:project, namespace: group, path: 'xyz')
+    context 'for a user' do
+      let(:user) { create(:user, username: 'jane', name: "Jane Doe") }
 
-      expect { duplicate.save! }.to raise_error(ActiveRecord::RecordInvalid, 'Validation failed: Path has already been taken')
+      it 'creates the route for a record on create' do
+        expect(user.namespace.name).to eq('Jane Doe')
+        expect(user.namespace.path).to eq('jane')
+      end
+
+      it 'updates routes and nested routes on name change' do
+        project = create(:project, path: 'work-stuff', name: 'Work stuff', namespace: user.namespace)
+
+        user.update!(username: 'jaen', name: 'Jaen Did')
+        project.reload
+
+        expect(user.namespace.name).to eq('Jaen Did')
+        expect(user.namespace.path).to eq('jaen')
+        expect(project.full_name).to eq('Jaen Did / Work stuff')
+        expect(project.full_path).to eq('jaen/work-stuff')
+      end
     end
   end
 
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index a4d177da0bea6611e93fb59f4d2df44c83b78983..e4f8417221505657d2af0b9f0f374be41202afe5 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -2931,7 +2931,7 @@ describe User do
       let(:user) { create(:user, username: username) }
 
       context 'when the user is updated' do
-        context 'when the username is changed' do
+        context 'when the username or name is changed' do
           let(:new_username) { 'bar' }
 
           it 'changes the namespace (just to compare to when username is not changed)' do
@@ -2942,16 +2942,24 @@ describe User do
             end.to change { user.namespace.updated_at }
           end
 
-          it 'updates the namespace name' do
+          it 'updates the namespace path when the username was changed' do
             user.update!(username: new_username)
 
-            expect(user.namespace.name).to eq(new_username)
+            expect(user.namespace.path).to eq(new_username)
           end
 
-          it 'updates the namespace path' do
-            user.update!(username: new_username)
+          it 'updates the namespace name if the name was changed' do
+            user.update!(name: 'New name')
 
-            expect(user.namespace.path).to eq(new_username)
+            expect(user.namespace.name).to eq('New name')
+          end
+
+          it 'updates nested routes for the namespace if the name was changed' do
+            project = create(:project, namespace: user.namespace)
+
+            user.update!(name: 'New name')
+
+            expect(project.route.reload.name).to include('New name')
           end
 
           context 'when there is a validation error (namespace name taken) while updating namespace' do