Congratulations!
I’m assuming from [name]Oren[/name] and [name]Rafi[/name] that your family might be Jewish? Big brother [name]Finn[/name]'s name is very Celtic to me; are you looking to balance one Hebrew name with one non-Hebrew name?
[name]Oren[/name]-- This is a very pleasant modern Hebrew name, easy for English speaker’s to pronounce. The only real association in the US at least is [name]Oren[/name]'s [name]Daily[/name] Roast, a coffee shop chain. But that’s not that bad. I think brothers [name]Oren[/name] and [name]Finn[/name] would work very well together, as [name]Oren[/name] is quite close to [name]Owen[/name], a similarly trim Celtic name.
[name]Rafe[/name]-- prefer the full name [name]Raphael[/name], nicknamed [name]Rafe[/name]. It’s more formal and gives him more flexibility as he goes through life.
[name]Milo[/name]-- brothers [name]Milo[/name] and [name]Finn[/name] again match very well without seeming like a boxed set. [name]Milo[/name] is a gently masculine name in the same vein as [name]Finn[/name].
[name]Dylan[/name]-- [name]Dylan[/name] is Welsh and therefore pairs somewhat well with Irish [name]Finn[/name]. However, this name is both dated to the early 90s, and unisex nowadays. I think [name]Oren[/name] and [name]Milo[/name] are better bets.
[name]Rafi[/name]-- again, prefer [name]Raphael[/name], nicknamed [name]Rafi[/name] (and every Israeli [name]Raphael[/name] I’ve known has gone by [name]Rafi[/name]).
[name]Theodore[/name]-- brothers [name]Finn[/name] and [name]Theo[/name] are again an excellent match. I think I slightly prefer [name]Milo[/name], as it’s a self-contained full name just like [name]Finn[/name], whereas [name]Theodore[/name] would have to be shortened.
[name]Heath[/name]-- Scottish moors, a candy bar, or a drugged-out Australian actor? Hard to know which association dominates.
[name]Remy[/name]-- love this suggestion, as it’s quite unexpected. It’s gaining traction and is no longer so unfamiliar, but I do think it’s not the best style match for [name]Finn[/name], as it seems more lush and less crisp.
[name]Zack[/name]/ [name]Zachary[/name] / [name]Zachariah[/name]-- these names are perfectly fine, but also dated somewhat to the 90s. Prefer [name]Oren[/name] or [name]Milo[/name].
MN for [name]Oren[/name] or [name]Milo[/name]: Should be 3 syllables to balance the 1+4 syllable combo of [name]Finn[/name] [name]Alexander[/name].
[name]Milo[/name] [name]Benjamin[/name]
[name]Oren[/name] [name]Broderick[/name]
[name]Milo[/name] [name]Emmanuel[/name]
[name]Oren[/name] [name]Evander[/name]
[name]Milo[/name] [name]Ephraim[/name]
[name]Oren[/name] [name]Everett[/name] ** fave
[name]Milo[/name] [name]Gabriel[/name]
[name]Oren[/name] [name]Julius[/name]
[name]Milo[/name] [name]Nathaniel[/name]
[name]Oren[/name] [name]Lionel[/name]
[name]Milo[/name] [name]Raphael[/name] ** fave
[name]Oren[/name] [name]Maximus[/name]
[name]Milo[/name] [name]Tobias[/name]
[name]Oren[/name] [name]Theodore[/name]