Hobozen, Hobozenful, Bill Murray ▲, Farfetch'd, An Angry Metapod, MementoMori - just to name a few. I've used a lot over the years.
As for real life nicknames, my name is short enough that it usually doesn't lend itself to needing a nickname. One girl insisted on an embarrassing one (candy cane) for one semester, but that was done to be flagrant. I've had pet names from girlfriends before, but those weren't anything unique.