Unfortunately mecha is right.  They will smurf right around your list no matter what you do.  Even smurfs that are more dedicated to a name typically only keep it for a few weeks or until its widely known who they are.  I wish something would be done but I have about given up hope.

[_]-Greyfox

I understand there is a packet sniffing protocol that is being developed for imbedding in the client side layer before hosted games.  Over a course of time, the ip of a smurf is reverberated.  Smurfs can be identified via this method, albeit heuristically after they have played under the name a few times.  Then, their geographic location is uncovered and mapped, and an anti-smurf goon squad is dispatched to their place.  Once revealed, and depending on how rampant a smurfing carrer they have, either the air is let out of their tires, or they get reported to the local homeland security as being overheard talking about how they can't wait to meet all the 72 virgins.

Of course, this is all fantastic imaginary alternate reality.