diff --git a/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb b/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
index 4fdcb682c2f694fee4ca1cd58265a284434e3c86..5481024db8eb4410a05d8fde648ea1df57cf121d 100644
--- a/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
+++ b/lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb
@@ -48,6 +48,14 @@ module Gitlab
             def self.name
               'Namespace'
             end
+
+            def kind
+              type == 'Group' ? 'group' : 'user'
+            end
+          end
+
+          class User < ActiveRecord::Base
+            self.table_name = 'users'
           end
 
           class Route < ActiveRecord::Base
diff --git a/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb b/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb
index 5397877b5d5af3dd4cabb0c3014d0ca62d13da7e..d60fd4bb5511f62e4a9c566b5927c487c22be556 100644
--- a/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb
+++ b/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb
@@ -41,7 +41,8 @@ module Gitlab
                                             new_full_path)
 
             update_column_in_batches(:routes, :path, replace_statement)  do |table, query|
-              query.where(MigrationClasses::Route.arel_table[:path].matches("#{old_full_path}%"))
+              path_or_children = table[:path].matches_any([old_full_path, "#{old_full_path}/%"])
+              query.where(path_or_children)
             end
           end
 
diff --git a/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces.rb b/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces.rb
index b9f4f3cff3cb5900b4b490fc58bcb9187465c80d..2958ad4b8e5f63927653a4c94a6e5ecdb22dc573 100644
--- a/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces.rb
+++ b/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces.rb
@@ -29,9 +29,15 @@ module Gitlab
             move_repositories(namespace, old_full_path, new_full_path)
             move_uploads(old_full_path, new_full_path)
             move_pages(old_full_path, new_full_path)
+            rename_user(old_full_path, new_full_path) if namespace.kind == 'user'
             remove_cached_html_for_projects(projects_for_namespace(namespace).map(&:id))
           end
 
+          def rename_user(old_username, new_username)
+            MigrationClasses::User.where(username: old_username)
+              .update_all(username: new_username)
+          end
+
           def move_repositories(namespace, old_full_path, new_full_path)
             repo_paths_for_namespace(namespace).each do |repository_storage_path|
               # Ensure old directory exists before moving it
diff --git a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base_spec.rb b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base_spec.rb
index 64bc5fc042960fdc004c86d51b5ff6da1b2321be..a3ab4e3dd9e2c45cf9783faf104d2a7fc2ba59ac 100644
--- a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base_spec.rb
+++ b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base_spec.rb
@@ -107,6 +107,15 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameBase do
         expect(new_path).to eq('the-path0')
       end
 
+      it "doesn't rename routes that start with a similar name" do
+        other_namespace = create(:namespace, path: 'the-path-but-not-really')
+        project = create(:empty_project, path: 'the-project', namespace: other_namespace)
+
+        subject.rename_path_for_routable(migration_namespace(namespace))
+
+        expect(project.route.reload.path).to eq('the-path-but-not-really/the-project')
+      end
+
       context "the-path namespace -> subgroup -> the-path0 project" do
         it "updates the route of the project correctly" do
           subgroup = create(:group, path: "subgroup", parent: namespace)
diff --git a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
index ec444942804c6d99675f0799b7020ef792f97441..c56fded751697243f39ff563be4a3ca7addbc8a8 100644
--- a/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
+++ b/spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_namespaces_spec.rb
@@ -137,7 +137,7 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
   end
 
   describe "#rename_namespace" do
-    let(:namespace) { create(:namespace, path: 'the-path') }
+    let(:namespace) { create(:group, name: 'the-path') }
 
     it 'renames paths & routes for the namespace' do
       expect(subject).to receive(:rename_path_for_routable).
@@ -177,6 +177,31 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameNamespaces do
 
       subject.rename_namespace(namespace)
     end
+
+    it "doesn't rename users for other namespaces" do
+      expect(subject).not_to receive(:rename_user)
+
+      subject.rename_namespace(namespace)
+    end
+
+    it 'renames the username of a namespace for a user' do
+      user = create(:user, username: 'the-path')
+
+      expect(subject).to receive(:rename_user).with('the-path', 'the-path0')
+
+      subject.rename_namespace(user.namespace)
+    end
+  end
+
+  describe '#rename_user' do
+    it 'renames a username' do
+      subject = described_class.new([], migration)
+      user = create(:user, username: 'broken')
+
+      subject.rename_user('broken', 'broken0')
+
+      expect(user.reload.username).to eq('broken0')
+    end
   end
 
   describe '#rename_namespaces' do