While keeping the mail address?
Well, Make a thread for a Name Request and you'll have your name changed. That's how few Members like me had their names changed.
In this category?
Xonotic - Help & Troubleshooting
Xonotic - Introduce your self
Done! I usually ask people to post in their Oh Hi Etc. thread to notify the community of their name change before I do it. I removed your separate thread in that section because it was redundant with your comment.