This is at its core a trademark infringement. Your username is the name that you are known by and the name that differentiates your products from those of others. Use dictates ownership of a trademark in the United States, consequently, you could obtain both monetary damages and injunctive relief against the person using your trade name. If the trademark was registered, you could be entitled to three times your damages plus attorney fees. I am more than happy to consult on this matter.
Answered on Dec 18th, 2013 at 4:30 AM