[name]Cara[/name] is similar in style to some of the other names you are considering.
I agree to [name]Lila[/name] is too rhyme-y
[name]Calla[/name] is good and is not too similar.
I knew a [name]Sasha[/name] and [name]Maya[/name] sister pair growing up.
I have a friend with a [name]Maya[/name] and [name]Sonia[/name] (know this one is not so popular now but I think it goes well).