There is a potion you can use to rename your character or your guild (if you are the guild leader) in just a few clicks.
To get this potion, visit the in-game Shop or the website shop for DOFUS and WAKFU.
The potion is linked to the account used to buy it, for a limited duration indicated in the Shop. That means it can't be given or sold to, or traded with, another player during this period.
If you're playing the game when you buy the potion, you'll have to log out and log back in to use the potion on one of your characters.