I have two of them; Azure and Eric.
Azure isn't just my nickname here; it's my nickname in real life, too.
Eric, well... There's a story to that one. One day a couple of months ago, in my Pre-Calculus class, my teacher tried to call my name. She calls me Azure, like a lot of my teachers and friends. But that time, instead of "Azure", she somehow ended up calling me "Eric" by mistake. I have no idea how that happened, but now my friend will never live that down. He spread that to our friends in Yearbook, and even to stage crew.
I'm much less fond of Eric than I am of Azure. Either way, those are my two nicknames.