Well...
Ilya is a boy's name, but I guess I could see it on a girl. It's got the -ya ending that would help it seem more girl-ish.
Problems might happen if an
Ilya when to a French-speaking country because il y a means 'there is/are..'
I think I like the
Ilya spelling better.
Ilia as too many straight upward letters in a row, I think.
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Sol Santiago,
Indigo Makaio, Aila
Celandine and Saska
Rose