Ibbie

This is very nice, I can also see Ebbie or Ebi used as a nickname for Isabel.

This name immediately made me think of the funny noises Shemp Howard the Three Stooges often made. It also looks like Ibi, a Hungarian nickname form of Ibolya (Violet). It seems kind of strange as a nickname for Isabella, like something a child with a lisp would make up.

Sounds like a little kid trying to say izzy. I don't think anyone would take someone named Isabel/Isabelle seriously if she decided to go by "Ibbie". Izzy is equally childish and informal, why not just go by Isabel/Isabelle? It's such a pretty name on its own, who needs a nickname?

My name is Isabel but I go by Ibbie since I remember. It's childish and immature but what can I say I LOVE it!

This is probably the weirdest nickname of Isabel that I've seen.

Not quite as awful as Izzie, but pretty horrible anyway. Very immature, in fact, flat out infantile. I'm not big on Bella or Belle either, in fact, I think the nicest nickname for an Isabella or Isabelle would be Isa.