Livejournal user name? In 1992, my part-time employer (full-time from 1995 to 2003) assigned me a userid of last name, first initial. I was lucky. The guy I took over several systems from was Tom Kinoshita. If your last name is more than 7 letters, you get the choice of either eight letters from last name, or seven letters plus first initial -- either way he got a lousy userid.
Anyhow, when the Web started rising two years later, I chose to use last name first initial pretty much everywhere. I treat the web as a "real name" environment. Previously, I'd used "Purple Magician" (satire book reference) for BBSs in the eighties, and Oreo Pasquale (complex story ending with a claim that my body weight was 48% DQ blizzard) from about 92 to 95. When I rejoined the dating world from 2006 thru 2008, I used "Taurid", a pun combining my stubborn sun-sign with the sound of "torrid". Taurid has been pretty much idled since the end of 2008.