Hey, something I can answer.
First off, 'round here we call them "characters," not "toons." This is NWN, not WoW.
To answer your concern, though... Sometimes the character approvers don't know a given name is copyrighted; it's as simple as that. Generally, they do a quick Google check, but sometimes things slip through the cracks. It happens. Besides, there are a couple of characters on Layo who were approved a LONG time ago whose names were taken verbatim from various myths and legends. "I am Ozymandias, King of Kings!"