I've had it for I think close to 13 or so years now; I originally picked it because I used to go to 'live' chat servers and it's a fast and easy name for people to type when they want to speak to me. It's also a furry, unassuming little animal but it does have sharp teeth and knows how to use them when provoked :-)
Black Bart is most commonly known as a figure from Western lore, isn't it? I'm also seeing that he was a pirate :-)
Black Bart was a stage couch robber in old California. He was famous for leaving poems at his crime scences
If you want to know more about Black Bart purchase the book Bad Company by Joseph Henry Jackson. A good read.