Well, it's not often I get called by a nickname nowadays, but that may be because I spend much more time around fellow students (in which case, for some reason, using names isn't always needed), but there's a few I used to get a lot, or still get on occasion.
'Lawless', because of my alias (not vice versa, as you'd probably expect). Usually online, I assume because it's often my screen-name it's used informally as a nickname.
'Snuffles', which was apparently my ex's codename for me before we got together. Still comes up when in the same circle.
'Werewolf', also started by my ex. Apparently I got it for my nocturnalism and because I occasionally file my nails into claws.
...Ok, I can understand that one.
Also, my lecturers have a habit of calling me 'you, with the hair'. That count?