As an
Isabel I am biased, but I strongly prefer this spelling.
Isabelle just seems unnecessarily elaborate and over the top. And I don’t know why, but the o in
Isobel jars me every time.
I get called
Isabella and
Elizabeth by people and it annoys the hell out of me. I hate those names with a passion (probably as a result).
Yes,
Izzy is common,
Bel less so.