User blog comment:DaNASCAT/Technical Update: June 11, 2013/@comment-1408288-20130611223147/@comment-452-20130611224552

It will still show your username. What this fix does is hides the welcome on RecentChanges and WikiActivity.

If you don't want it to show your username, you can change it here: MediaWiki:welcome-user. You can just change it so "Wikia", if you like.

For more info about the welcome tool, see Help:Welcome_Tool.