There have a filter hook “starter_admin_menu” for admin menu. You’ll just drop the following code in your custom-starter/custom-functions.php file and see the magic.
Snippet
//* Change Default Menu with Site Name add_filter( 'starter_admin_menu', 'gd_admin_menu' ); function gd_admin_menu( $menu ) { return __( 'Genesis Developer', 'starter' ); }
That's it!