Multiple usernames for the same account

I haven’t seen anything regarding having multiple user names for the same account. You could create different admin accounts for each of the names you want to reserve, or you could install a plugin like Restrict Usernames to prevent users from using the names you want to reserve.

You can’t assign multiple names for one user. A dirty hack would be to create a bunch of unused dummy accounts with no capabilities simply to reserve names.

A more elegant solution would be to hook filters for various fields and apply a blacklist of certain names. The filters are invoked from the insert_user() definition in wp-includes/user.php. This php example should work:

add_filter('pre_user_login', 'scy_check_names');
add_filter('pre_user_nicename', 'scy_check_names');
add_filter('pre_user_nickname', 'scy_check_names');
function scy_check_names($provisional) {
  $black = array('administrator','admin','editor','moderator','mod','cialis');
  if (in_array($provisional,$black)) wp_die('Invalid name, try something different');
  return $provisional;
}

This isn’t very elegant either, but gets the job done. You could use regular expressions to capture more variations like “adm1n” or “_admin_”. The error handling could certainly be improved. It’s a start.