Heh. It came about a bit by accident, really. I didn't get into things that required usernames until I'd already been on the internet for a while. "Glishara" was the name of one of my Diablo II characters, a sorceress whose name I created by my standard RP-character-naming method of picking letters I like and then filling them in with other letters until they're pronounceable.

When I needed a username for something (probably a geocities page or something), I tried a few things which all failed, then plugged in "glishara", since it was a name I saw a lot. It worked! It's a total nonsense-word, which means I never have competition for it. By the time I got onto LJ, it had become my default username. Boring, I know.