Rebecca is very nice, and it will never really go out of fashion or be "unique." It's familiar to everyone.
I know several Rebeccas of different ages, and only a couple of them go by nns. One is
Becky and one is
Becca, and I know one
Becky who isn't a
Rebecca.
Rae to me seems a stretch.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin