At the moment you can rename a character. It does cost $18.00 (or 1800 Crysta), and you have to transfer your character to a server with a character of the same name already in existence, but... You can rename your character.

They are looking into releasing a way to Rename characters (Probably a Namingway reference from IV and IX), but at the moment, this is planned for 2.2 or Later.