Since there's already a leahalalela.deviantart.com, that appears to be a normal DevArt user, that's probably why you couldn't use it as a group name?

Yoinked from: http://makeagroup.deviantart.com/
Please note that just like usernames, there cannot be two accounts using the same name. Please check to ensure the name you are trying to use for your group isn't already taken by another user, or group, or chat room.
At any rate, I'll suppose I'll join.
It could be interesting and/or come in handy.