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Following the 2 syllable ending in n pattern, with [name]Collin[/name] and [name]Brennan[/name], I like:
[name]Mason[/name], [name]Lincoln[/name], [name]Hudson[/name], [name]Owen[/name], [name]Simon[/name]
I also notice that both your sons names have double letter. Here are some double letter boys names I like with [name]Collin[/name] and [name]Brennan[/name]:
[name]Wyatt[/name], [name]Maddox[/name], issac, [name]Forrest[/name] , [name]Russell[/name]
And here are some with n ending and double letter that work well with your other boys names :
[name]Aaron[/name], [name]Griffin[/name], [name]Dillon[/name]
Thanks Paw! It’s so hard to find another boys name that I love as much as my boys’ names. We have had [name]Owen[/name] and [name]Griffin[/name] on the list at one point 
[name]Lincoln[/name] makes me think of [name]Lachlan[/name] but I doubt I’d be able to sell DH on it.
Question: is [name]Finnian[/name] ([name]Finn[/name]/ [name]Finegan[/name]/ etc) really popular once all the spellings are combined?
I don’t think [name]Finnian[/name] is over popular and it does work with your other boys names.
I like [name]Jude[/name], [name]Graham[/name] (perhaps the [name]Graeme[/name] spelling would appeal also?) and [name]Declan[/name] from your list, though [name]Colin[/name], [name]Brennan[/name] and [name]Jude[/name] really stuck out for me. Very handsome names for brothers!
From your list I like [name]Graham[/name] and [name]Jude[/name] the most with [name]Colin[/name] and [name]Brennan[/name] and think wither would complete a handsome set.
Here are a few more ideas:
Alaister
[name]Ivor[/name]
[name]Jasper[/name]
[name]Lorcan[/name]
[name]Malcolm[/name]
[name]Rhys[/name]
[name]Rory[/name]
[name]Shane[/name]
Thanks guys! Great ideas. Keep em coming
I think [name]Declan[/name] goes great with your boys but if you want to keep the double letter I’d go with [name]Finnian[/name].
I really like [name]Jude[/name], [name]Declan[/name], and [name]Graham[/name]!
I can’t believe no one suggested [name]Duncan[/name] yet! It’s perfect! [name]IMO[/name], of course!
[name]Jude[/name] really stood out to me!!! So handsome