Dennis "Thresh" Fong. Jonathan "Fatal1ty" Wendel. And I just read about Major League Gaming signing a Halo player named Dustin "HP Darkman" Langton.
Michael Jordan, I don't believe, has ever referred to himself as His Airness. Ted Williams didn't wake up one morning and declare, "From now on, I'm the Splendid Splinter." They earned those titles from cheering fans and awed sportswriters.
Then again, how can you come up with a good nickname for someone who doesn't move? Professional gamers don't have any unique physical motions that can be turned into cool nicknames, so professional gaming will never have the equivalent of Elroy "Crazy Legs" Hirsch. Dennis "Pushes Up His Glasses A Lot" Fong? Dustin "Mouth-Breather" Langton? Bah.
-- Z.