Some are simple - actual names, names/models of truck. Others are not as simple to figure out. Mine (cbbr) is the first AOL account name I had in 1993. I was in school in Baton Rouge at the time, but not from baton Rouge, so I used c(had) b(erry) b(aton) r(ouge) as my screen name/e-mail address. It stuck and I have been using it ever since.