I was Emohawk from when I started needing a name to use on the internet up until a few years ago. I stopped using it because it wasn't very original. Instead, I'm using a name that isn't very creative. GTS is the top trim level of MkII Supra in Canada (the trim levels didn't have names in the US), and BlackIce just sort of sounds cool.
I was Emohawk everywhere on the internet for ~10 years (there's a guy I used to hang out with that didn't even know my real name), but BlackIce is just sort of provisional until I figure out something original and creative.