The name Babylon was picked because it means "Gate of God." Why is that? Because there was a jump gate next to the station. What's next to DS9? Why it's a wormhole!
Considering a Jump Gate is basically a comon occurance in the Babylon 5 verse what with it being a device to use their version of FTL on ships not big enough to do it on their own, whereas the wormhole was a super rare occurance that made it practicle to get to a distant and unexplored region of the galaxy and there are no other wormholes like that IT'S NOT A STOLEN IDEA. Their not even remotly similar except big blue thing ships fly through.