Isis nn Ice - Sounds silly, and I've always associated Ice as a boy's nn anyway. It sounds like the nn of some action hero.
Isis is lovely on its own, and is so short that it doesn't need a nn.
Freya nn
Rae -
Rae sounds a bit contrived to me. I'd go with
Frey, but again, I don't think
Freya needs a nn.
Ophelia nn
Lia or
Phebe - I'd go with
Lia, since
Phebe is too far from
Ophelia. If I liked
Phebe that much, I'd use it as a full name and not a nn.
Indiana nn
Indy or
Anna - Definitely go with
Indy. I love the spunkiness of
Indy, and I think it's great that you've got
Indiana picked out for a girl and not a boy.
Aurelia nn
Aura,
Rae, or
Lia - I'd use
Aura. It's definitely unusual and pretty.
Rae, again, seems a bit contrived, and
Lia is just a trifle plain.
Beatrixnn
Bee or
Trixie -
Bee's cute in a jazz age kind of way.
Trixie sounds a bit like a stripper's name.
Constance nn
Connie - I'm with you on not liking
Connie. Perhaps
Constance is capable of standing on its own.
Bellona nn
Bella or
Ella - I think
Ella is prettier than
Bella, but there are so many little Ellas running around anymore that
Bella might be a better bet.
Leonora nn
Leona - Eh,
Leona reminds me too much of
Leona Helmsley. I like
Lee or
Nora better.
Lucian nn
Lucan -
Lucian doesn't really need a nn, and I think
Lucan is fine on its own. If you like
Lucan that much, don't bother with it as a nn.
Orpheus nn
Orfeo -
Orfeo sounds a bit silly. It's more of an opera character's name than a real boy's name.
Phoenix nn
Nyx - Ooh, I like this! It's short and snappy. I wonder how many parents have thought of it?
Cyrus nn
Cy - It's okay, kinda blah. It's like a parent with a son named
David calling him
Dave.
Jasper nn Jazz - Interesting, but I've always liked names that have the "jazz" sound in them.
Romano nn
Roma - Sorry,
Roma is a girl's name in my mind. Why not Rome? It's the name of a fascinating historical city.