WordPress MU

Is there somewhere a username blacklist available or a service / plugin to prevent registration of not wanted usernames?

its built in. did you even have a look at the wpmu siteadmin options?

The option is called: Banned Names can't get more obvious than that, can it?

The description is: Users are not allowed to register these blogs. Separate names by spaces.

Did you not wonder if there was a pre-build list?

Yes i was looking for a pre-build list. Also checked Google for not allowed username list but couldn't find anything.

I think someone missed the point here. ikzitop asks about banned usernames and Ovidiu replies back with a way to block blog names. In my experience, these are two very different things. Before we get too far here, which one is it that you want to block, ikzitop - usernames or blog names?

no worries ikzitop, Ovidiu is correct.

from function wpmu_validate_user_signup in wp-includes/wpmu_functions.php
$illegal_names = get_site_option( "illegal_names" );

AND

from function wpmu_validate_blog_signup
$illegal_names = get_site_option( "illegal_names" );

Same Banned Name list filters BOTH blognames AND usernames.

Have fun adding those "bad words".