I knew a few in school, and my daughter's kindergarten teacher this year was named Tiffanie. Very nice teacher too.
I've always liked the name Tiffany, but there's no doubt it has a fairly downmarket image. I am still amazed that Donald Trump used it for his own daughter, it is not the name you might expect a multi-gazillionaire to want to use, except that Trump has a kind of twisted sense (of humor?) and might possibly have been being ironic...or else it was Marla Maples's doing.