Doubt they're going to allow that, but I do feel your pain. I originally created a Mobage account using my real name; I didn't realize at the time that they would use that name for EVERY SINGLE one of their games.
I tried emailing and what not, and the only option that was left for me was to make a new account when I got a new phone. Atleast in fantasica, your cards and most of your TE/pots are transferable - I just traded all my cards over and then emailed mobage about deleting my old account. Now I just need to grind away at the level/skills.