I wonder too. Maybe it turned in an European language and not a Semitic one? By misprononciation? When I hear the English way of prononcing Hebrew names, I think everything is possible :p Apparently Ishbel and Ishabel exist in Scottish though. And Baal was called Bel in Assyria and Palmyra. I also remember that I got a name close to Isabel on a name generator (was it Carthaginese, Phoenician... I don't remember...), something like Ishbal or Ishbel.