I think
Gillian (and for that matter
Lillian) are more classic names, like
Elizabeth or
Catherine, or even
Lily. A few people get named them every decade. Maybe more than a few were in the 80s, but it definitely isn't like
Amanda,
Tiffany,
Brittany,
Stephanie... which just screams "I was born in the 80s" to me.
I really like
Gillian, and I think it is lovely. I think
Jill is more avoidable if you use
Gillian.
Ophelia was one of my favorites for a long time. It's in our family tree, and it has a lovely sound, but I couldn't get over the Shakespeare association, either.