The Elisabeth > El-Isabeth > Isabeth > Isabel hypothesis is more likely in more opinion. Keep in mind that many biblical names (like Elizabeth) end in -el and -bel (Abel, Jezebel, Mehitabel, Rachel, Michael, Gabriel), which could explain the change (since the [th] sound doesn't exist in romance languages).
And in Provençal the feminine of beautiful is "bela" - the name should have been Isabela. And there are many names that end in -bel and have nothing to do with "beauty" - Amabel and Mabel, for instance.
~ isla, sophie, embla, zephyra, vida, clementine, swanhilda, calliope, magnhild, salomé ~
~ rémi, archer, louis, aurelian, pollux, lucan, storm, henry, nicodemus, maximilian ~This message was edited 9/30/2012, 3:29 PM