I made the mistake of signing a newsgroup post "Historian, Pennsylvania State Chess Federation" years ago, and I was mocked in many threads as "The Historian", with a capital "T". After a couple of years, I switched to the screen name The Historian just to annoy folks on the chess groups. Not that I need help doing it, mind you.
In the past I've had friends who have called me the Neilster, but that hasn't been recently. I've never been called "big guy" or any of the other friendly terms folks use - I must have been too proper/modest/well-spoken/stuffy for people to feel comfortable using it with me.