To be honest, I don't like the name I use, but like MrNobo1024, I use it to be consistant.
My oldest nickname at one point was Bucknut due to very odd circumstances (don't ask unless you really want to know) and I got tired of people changing the B to an F or assuming I was some perv.
Then I started working for an ISP and had to pick a 'business' ID, and they just took the first eight characters of my name. No biggie.
Then, as I went to other sites and tried to register, it kept saying that the stuff I wanted was taken, except for these eight letters.
There's only been one site where they didn't work - really wish I remembered which. heh.