There is a reason some people have a * in front of their names. It means their nick is also their account name. Since you can change your nickname at any time, it was a method to tell who was legit and who wasn't. Ie if you see someone with a nick *Stefan, it means it's actually Stefan on his Stefan account. Someone walking around with the nick Stefan, however, is not actually using the Stefan account, but is pretending to be.

How he managed to get it on this server though I don't know.