[name_f]Isabella[/name_f] [name_f]Cathrine[/name_f] sounds the most sophisticated, however my favorite name you have is [name_f]Aria[/name_f] [name_f]Cathrine[/name_f]
I personally would go with [name_f]Aria[/name_f] [name_f]Catherine[/name_f]! Although I love [name_f]Isabelle[/name_f] [name_f]Catherine[/name_f], both names are rather popular at the moment (at least where I am located), so I think [name_f]Aria[/name_f] adds a great twist and balance
I think both are lovely and sound equally as sophisticated. I think [name_f]Isabella[/name_f] lends itself a little better to the nn [name_f]Bella[/name_f], if you’re interested in that (though I think [name_f]Isabelle[/name_f] nn [name_f]Bella[/name_f] is totally fine too). Both feel very timeless and sophisticated.
If you’re going for sophistication, I would vote for [name_f]Isabelle[/name_f] [name_f]Catherine[/name_f]. [name_f]Isabelle[/name_f] feels regal and sophisticated, whereas [name_f]Aria[/name_f], as beautiful as it is, feels more cute and modern.
I would choose [name_f]Isabelle[/name_f] [name_f]Catherine[/name_f] > [name_f]Bella[/name_f] [name_f]Catherine[/name_f], because [name_f]Isabelle[/name_f] offers both a elegant full name and a cute nickname (Belle, Bells, [name_f]Bella[/name_f], [name_u]Issy[/name_u], etc.)
As for [name_f]Isabelle[/name_f] vs [name_f]Isabella[/name_f], I agree with starless - [name_f]Isabella[/name_f] quickly goes to [name_f]Bella[/name_f] very intuitively. [name_f]Isabelle[/name_f] could have the nickname [name_f]Bella[/name_f] as well, but [name_f]Isabella[/name_f] makes more sense in my opinion.
Congratulations on your baby girl! Wishing for a safe and happy birth.
I’m split between [name_f]Aria[/name_f] [name_f]Catherine[/name_f] and [name_f]Isabelle[/name_f] [name_f]Catherine[/name_f]. Both sound sophisticated to me… it’s just a matter of which one works best for you. [name_f]Do[/name_f] you want a longer name or a shorter name? I think, for me, it would depend on last name also.
[name_f]Belle[/name_f] or [name_f]Bella[/name_f] could certainly work as a nickname for [name_f]Isabelle[/name_f].
[name_f]My[/name_f] favourite is [name_f]Aria[/name_f] [name_f]Catherine[/name_f], but I think [name_f]Isabelle[/name_f] [name_f]Catherine[/name_f] is the most sophisticated.
[name_u]Izzy[/name_u] would be a cute nickname! [name_f]My[/name_f] daughter’s middle name is [name_f]Elizabeth[/name_f] and sometimes we call her first name + [name_f]Lizzy[/name_f].