Although my name is bloody obvious, I do use "MoerasGrizzly" as a moniker just about everywhere else. My romantic mind indicated that one should not choose a nickname for himself, but let other's choose for him.
In High School, I was often refferred to as both "A bear" (due to various factors including build, being extremely huggable, tendency to wear black and brown, and the habit of pacing around "like a polar bear" (dutch saying). I was also refferred to as "that guy who lives in the swamp" (My villlage was very small and very far off, due to the high school there being crap). Hence, "SwampGrizzly". MoerasGrizzly since I wanted to show my dutchness, but a lot of people don't catch it's an adjective.