It's a grandmother name where I live.
I quite like
Susan, but the only nn I enjoy is
Susie -
Sue does nothing for me at all. So I wouldn't use it:
Susannah is a family name which I could use as a mn, but as a fn I'd go for either
Suzanne or
Suzette.
For some reason, one of my mother's friends nicknamed her
Susie - her only given name was
Beatrice! I suppose that's why I like
Susie. She seemed to attract random nns: another friend always called her
Bess.