The true genesis for that name (which I just made up upon seeing this thread) is that someone on an outer rim world asks Obi-wan who he thinks he is, dressing up like a Jedi, asking if he really wants to be associated with that group of has-beens. He asks who Obi-wan is again, seriously. Obi-wan retorts: 'a has-been', and the guy asks if he could call him 'Ben' for short.
That will do nicely, I think.