I know about twelve girls with the name
Jen,
Jenn,
Jenna or
Jennifer. I was a mid 80's baby.
I think
Jennifer's comeback will be in our grandchildren's day. It has just saturated the world too heavily to be making a comeback yet though. I could see it making a "comeback" as the middle name du jour in a few years, though, as an honouring choice. I'm even thinking about it myself!