Sort of. I've had mine changed (to my realname) and there are a handful of other precedents (I know of fever and giant) as well, but it has to be done manually by one of the gods. If you ask nicely, you might have yours changed as well.
Thanks, that's what I thought, but I figured I'd ask in case there was something else I didn't know about. (e.g., "We did it once, but never again" or "Yes, go fill out this form" or something)