Greetings,
If you made a mistake while renaming your character (or feel that your new name isn't quite as good as you originally thought it'd be) after the World Merge please consult a GM in-game. Please keep in mind however that this is a one-time offer.
I also wanted to say that I understand the frustration that can come from a forced rename in these situations, and that we do read and take your feedback seriously. I'll continue to gather your comments and put them forth to the teams so that your concerns are heard.