My stepdaughter is
Jennifer. When I met her she went by
Jenny, which is what the family called her growing up. At some point through counseling she changed to
Jennifer as a way to shed childhood things and "grow up."
I like both
Jennifer and
Jenny, although I'm fond of the spelling
Jennie.
I had a roommate in college named
Jennifer. At that time
Jennifer was being used for newborns like crazy but you never met a grown-up
Jennifer. Her middle name was
Elizabeth, and I remember commenting to her that she had long names.