I would use it!
If you don’t have any back-up names that you love equally or almost as much as [name_u]Noah[/name_u], than I say use it!
I think it helps that they are different genders and will have different spellings of the name.
Yes!
If you decide to go with something else, perhaps [name_m]Joah[/name_m] / Joaha would work.
I love [name_u]Noah[/name_u]!
I’d say why not tell them it’s your favorite and ask them if it would bother them if you used it. That should avoid any issues I think.
You can totally use it.
Dh has two first cousins (they’re also cousins; not siblings) who used the same name for their little boy just a few months apart. They probably see each other a few times a year & have different last names. It’s totally not a big deal. [name_f]My[/name_f] dh has about a zillion cousins who all are having kids, so I’ve given up on taking names off my list that may be used by one of them. Specifically if it’s a cousin that we’re not particularly close to. [name_u]Noah[/name_u] is a beautiful name, by the way.
Hope this helps. 