Like many others here my user name comes from a Character, in this case my 1st edition AD&D Paladin, Sunglar Redstrik. Although I had played a few characters before, I usually was (and still am) the DM. I love being a DM, but this was the one character I loved to play.
He eventually became an NPC in my long running fantasy campaign, actually two because a second generation NPC was named after the first Sunglar. My best friend who DM’ed the original game I played the character in has dropped him as an NPC in a couple of places.
I even have convinced my wife to agree that if we ever have a boy I can name him Sunglar!
The name is unique enough I get to choose it everywhere, so if you see a Sunglar, it’s probably me.