Is it a character from a book (and if so, which book/game/movie/song/etc did it come from)? Is it a strange eldritch god, a nickname, an animal, a collection of funny sounding words?
I originally wanted Sparrow as my forum name because I had been wandering in and out of the forum, just lurking for a while before I signed up, and I wanted something representative of the flitting-in-and-out style that I started with. I also wanted something gender-neutral, to see if that changed the way people interacted with me. But Sparrow was taken, so I decided Starling was an acceptable alternative

Now everyone else needs to join in the storytime and satisfy my curiosity!