Ophelia for me is this painting:
and 'drowned' would be my first word association. Also, while it looks pretty, it undeniably sounds like 'oh feel ya' or 'oh failure', depending on your favoured pronunciation. So no, not a fan.
I love
Gillian. It doesn't seem 80s to me - all the Gillians I've known were older than that, and anyway, it's unusual enough not to feel dated. I think
Gill (which I don't mind at all) is likely, but I have known a
Gillian who wasn't one, so it is possible. It would be really great to see a little
Gillian. I would yay loads.:)