I wouldn't be surprised to see
Bet and
Bette coming back.
Liz,
Lizzie,
Liza,
Lisa etc have dominated the field of
Elizabeth nicknames for so long that practically anything would be fresher and more interesting. I'd prefer
Betsy, but I don't expect a resurgence.
If I had to use a form of
Elizabeth as a fn, it would be a dead heat between
Elspeth and Elsabe: I'd have to spin a coin.
My daughter
Beatrice had difficulty with radio phone-ins: the people on her favourite station were unfamiliar with her name, so she took to calling herself
Bessie. They all recognised it happily. What she didn't know was that my mother, also a
Beatrice, was always called
Bess by one of her friends.