Board Thread:Questions and Answers/@comment-71.168.133.83-20180407201025/@comment-25874537-20180407214907

To prevent a username from showing up on future edits that you make, simply don't log in to your account, and the edits will be associated with an IP address instead of the username.

There is no way for the moderators to delete a username from edits already made unless those edits violated the terms of service. But, if you change your username, the current username associated with your past edits will change to the new name.

http://community.wikia.com/wiki/Help:Changing_your_username