I've always liked the sound of
Jennifer. That was never the problem for me. It was its rampant popularity. Even so, I briefly considered it for dd #2 because the name I really wanted didn't flow with our surname (I used it anyway). I do like the nn
Jenny, however, I think I'd be more inclined to use
Jenna or the full name. Have I known any born past 1990? Sure, although I couldn't tell you exactly how many. I've known quite a few over the years (before and after 1990). I'd say most have gone by
Jennifer or
Jen.
BTW, I read somewhere that
Jennifer was so common in the 70s that by the 90s census, it officially became one of the top 10 names used in this country for women (of all ages). That's quite an impressive feat for one decade!