Below are my current favourite boy names. For a brother to [name_m]Levi[/name_m] and [name_u]Max[/name_u], do you prefer:
I also really love, but can’t use for various reasons: [name_m]Jonah[/name_m]/[name_m]Jonas[/name_m], [name_m]Benjamin[/name_m], [name_u]Seth[/name_u], and [name_m]Ezra[/name_m].
I love all of your choices! I think I prefer [name_u]Noah[/name_u], but only slightly.
I like [name_m]Samuel[/name_m]. [name_u]Sam[/name_u] is classic. [name_u]Noah[/name_u] has always felt a bit trendy and childish to me. Have you considered [name_m]Abraham[/name_m]? It is less common and feels strong. [name_m]Moses[/name_m] is another striking choice.
I like them all! I think [name_m]Levi[/name_m], [name_u]Max[/name_u], and [name_u]Finn[/name_u] probably fit together the best, but [name_m]Samuel[/name_m] is far and away my favorite! It feels more classic than modern or trendy, but I feel like it fits in really well with [name_m]Levi[/name_m] and [name_u]Max[/name_u]. [name_u]Dani[/name_u], [name_m]Levi[/name_m], [name_u]Max[/name_u], and [name_u]Sam[/name_u] are so cool together, and I easily find [name_m]Samuel[/name_m] the most handsome. 
I really love [name_u]Noah[/name_u] and [name_m]Isaac[/name_m], though, too!
Good luck!
[name_m]Isaac[/name_m] and [name_u]Finn[/name_u] are the best fits with [name_m]Levi[/name_m] and [name_u]Max[/name_u]. I prefer [name_m]Isaac[/name_m] because it has a hard consonant sound like [name_m]Levi[/name_m] and [name_u]Max[/name_u]; [name_u]Finn[/name_u] feels a bit weak in comparison.
I think [name_m]Isaac[/name_m] fits best with [name_m]Levi[/name_m] and [name_u]Max[/name_u], but they’re all nice choices. [name_u]Noah[/name_u] felt trendy 5-10 years ago, and now it’s settling back into classic territory.
My favorite is [name_m]Samuel[/name_m]. I’ve had it on my list forever. [name_m]Samuel[/name_m] is classic, and you aren’t meeting so many baby Samuels as much as [name_u]Noah[/name_u] or [name_m]Isaac[/name_m] or [name_u]Finn[/name_u]. I do love [name_u]Noah[/name_u], but it is so popular, I hear it all the time so it is getting to be boring. I love [name_m]Isaac[/name_m] too, but it is gaining popularity near me so I know a bunch. I don’t like [name_u]Finn[/name_u] as much, because it is really short and I hear it all the time on hear so I’ve gotten bored of it.
[name_m]Samuel[/name_m] is amazing. It is classic without being boring and it isn’t trendy like some of the other biblical names like [name_m]Asher[/name_m] and [name_m]Ezra[/name_m] and [name_m]Isaac[/name_m] and [name_u]Noah[/name_u]. That’s I why its my favorite out of the ones you listed. I love [name_m]Ezra[/name_m] and [name_m]Benjamin[/name_m] on your not usable list as well.
[name_m]Levi[/name_m], [name_u]Max[/name_u] and [name_u]Noah[/name_u] sounds really nice together. I don’t like [name_m]Samuel[/name_m], unless you call him [name_u]Sam[/name_u].
I love the name [name_m]Isaac[/name_m], I read it means laughter. Also, [name_u]Noah[/name_u] is so handsome, but even more popular than [name_m]Isaac[/name_m]. [name_m]Isaac[/name_m] has been a favorite I name for a while.
[name_m]Isaac[/name_m] [name_m]Nathaniel[/name_m]
[name_f]Do[/name_f] you like [name_m]Adrian[/name_m]?
I like all of them except for [name_u]Finn[/name_u]. [name_m]Samuel[/name_m] especially if you call him [name_u]Sam[/name_u] sounds good with your others. [name_m]Isaac[/name_m] is my second fave.
I have always loved [name_m]Isaac[/name_m]. As mentioned, I like the hard consonant sound repeating in [name_m]Levi[/name_m], [name_u]Max[/name_u], and [name_m]Isaac[/name_m]. [name_u]Noah[/name_u] and [name_u]Finn[/name_u] feel too soft. [name_m]Samuel[/name_m] is alright.
I think I like [name_u]Finn[/name_u] the best.
I think [name_m]Samuel[/name_m] (nn [name_u]Sam[/name_u] for sure) and [name_m]Isaac[/name_m] is my fave. Husband not as big a fan of [name_m]Isaac[/name_m] as I am but still likes it. He also likes [name_u]Sam[/name_u] and I feel it is the easiest choice for us. I would just use [name_u]Sam[/name_u] not [name_m]Samuel[/name_m] but since there is a [name_f]Samantha[/name_f] nn [name_u]Sam[/name_u] for girls, I feel like one should use [name_m]Samuel[/name_m] for the boys full name.