I'm always amused at how much LNR gets out in real life too. It sounds funny out loud, but even Richard's parents call me it in mail. In a lot of ways it's kind of like that's my initials, or at least it gets used in places other people use initials anyway. That's why ecb39 doesn't feel like quite me. Though Paul vetoed me from conspiring with the operators to get me a spare CRSid for lnr. And as you can see I use it lowercase too these days, though initially it was always in caps.
Other nicknames I've had have mostly died. I was Polar Blair for a long while at school, and somehow that got mutated in Polaroid at times too. And I've been Perditax sometimes as well, nickname given to me by a certain Gotterdamerell. I mostly save that as the name of the windows personality of my computer these days, though it sometimes gets an outing on irc. eleanorb has only ever been a username, but I often find myself having to hit backspace at the end when typing my name, I've been using it so long. hert0145 has been gone for 5 years now, but I still half fancy the idea of a tshirt with it on.
To me I'm just me.