My friends and I used to be in lots of heavy metal and hardcore bands in high school. It was common place to be known for your first name and a part of the band you were in. A buddy was known as Davey Hatchet (lead singer of Hatchet and Annie) and another was Andy Diehard (singer of Diehard Youth). I was known for creating and fronting a grind band that had no set name.
We had no name and no set songs. We just all had been playing together so long that, like classic Jazz bands, you just went with what felt right and it all came together. Anyway, I became known as Tristin Grind (for the type of music the band played). I just used it for all my screen names and I havent changed it since. Too much hassle to pick something new.