IRL, no. People just call me Garret. Except for a couple of people at school I didn't really know that well called me Gary, the little foreign kid who didn't speak English well called me Greg for some reason, and this lady my dad hired to help clean his bingo hall calls me Jarret, since she apparently misheard the first time I said it and she doesn't notice when I correct her. XD
Online I usually go by Kenji, though I'm using Gary a lot more often now. I don't have any other widely-used nicknames, I don't think.