Mine originated back in my not-so-honest hacking/keygen creation days (glory be to hex editors ) and was a moniker 'given' to me by the irc channel(s) I frequented involving said communities (was originally 'Green Goblin'). Corny and cheesy as it is, "everything" was cooler with a 'Z' added to it back then... ugh.
Later when I became 'legit' (honest paying customer.. hehe), I capitalized the "CAN" in the name to represent you "CAN do what you set your mind to". After joining NWN/LF groups, I tacked on the .2da since it was the most frequent style of modding I specialized in.
Still a cheesy handle, but I've had it so long now I've grown old and accustomed to it, hehehe. Most every site I've joined, past and present, I have the same username or variant, and am known as such.