Man, it's a pity they recycled the name from the longstanding FR deity.
I heard them address this in one of the podcasts (I think). They knew they wanted a Bane-type god for 4th Ed, but none of the names they came up with stuck. They decided to just go ahead and call him Bane. Personally, I like it. It's such an easy, catchy, powerful name. It really fits a god, particularly this sort of god, and it makes a good warcry for NPCs.
It mixes the Roman centurion look with George Pérez Ares, from the Wonder Woman comics:Very badass. Too bad its completely unoriginal and looks almost exactly like the Greek god Ares...