To be honest, I kind of stole this name from someone else. There was someone on another forum named John Grey Beard. I though it was really cool, and since my name is also John, but my beard isn't gray (yet), I started calling myself John Red Beard.
Before that, I was always JohnRaptor, a name I picked when I got my first AOL account, the same year the original Jurassic Park came out. I still have that name on my DA account and a few other places.