[name_u]Linden[/name_u] has already been nixed. Thought of [name_m]Linus[/name_m] even though it’s pronounced differently. But, I can’t really use an S ending name as our last name ends in S.
This is for a middle name. The first name ends in N so [name_u]Linden[/name_u] wasn’t really a great option but that’s an example of a name I really like.
[name_m]Can[/name_m]'t wait to hear your creative ideas!!
Callen/Callan
[name_u]Lindsey[/name_u]/Lindsay
[name_u]Brooklyn[/name_u]
Most of these are a bit of a stretch, but I hope this helps!
[name_u]Lionel[/name_u]
[name_m]Link[/name_m]
[name_u]Flynn[/name_u]
[name_u]Berlin[/name_u]
[name_u]Nolan[/name_u]
[name_m]Rolland[/name_m]
Lenny
[name_m]Len[/name_m]
[name_m]Leonard[/name_m]
[name_u]Lionel[/name_u]
[name_u]Lennox[/name_u]
[name_m]Lindell[/name_m]
Lindley
[name_m]Linwood[/name_m]
I like [name_m]Linwood[/name_m]. It’s a direct nod to [name_u]Lynn[/name_u], but it’s a unique spin and a real name! [name_u]Lynn[/name_u] was also historically a boy’s name (though I know you said you’re avoiding the N ending with the first name).
Lyn means lake so [name_u]Lake[/name_u] maybe?
Lysander, [name_u]Lyle[/name_u] and [name_u]Lindsey[/name_u] came to mind
Flynn
[name_m]Hamlin[/name_m]
[name_m]Harlen[/name_m]/Harlin/Harlon
[name_u]Marlin[/name_u]
[name_m]Merlin[/name_m]
[name_u]Quinlan[/name_u]
[name_m]Wayland[/name_m]
[name_m]Waylon[/name_m]
[name_m]Zebulon[/name_m]
[name_m]Arlin[/name_m]/Arlon
[name_m]Calvin[/name_m]
[name_u]Carlin[/name_u]
[name_m]Conlan[/name_m]/Conlen
[name_m]Colin[/name_m]
[name_m]Cullen[/name_m]
[name_m]Devlin[/name_m]
[name_u]Dillon[/name_u]
[name_u]Elon[/name_u]
[name_m]Elwinn[/name_m]
[name_u]Fallon[/name_u]
[name_m]Franklin[/name_m]
I may have been a little liberal with the vowels in the ending, but some creative spelling would probably smooth it over. I’m also not sure that I didn’t just make some of those up 
Linwood is the first name that comes to mind.
Lincoln
[name_m]Lindell[/name_m]
[name_u]Lynden[/name_u]
[name_m]Lynch[/name_m]
[name_m]Link[/name_m]
[name_u]Lynx[/name_u]
[name_m]Clinton[/name_m]
[name_u]Glenn[/name_u]
[name_m]Lindos[/name_m]
[name_m]Tomlin[/name_m]
[name_u]Flynn[/name_u]
I know you’re not keen on the name ending in an ‘n’… but this was hard!
Franklyn
[name_m]Llewyn[/name_m] / Leuwyn / Louwyn “louh-win”
Dilyn
Callyn
[name_u]Harlyn[/name_u]
[name_f]Oaklyn[/name_f]
Vallyn
[name_m]Stanly[/name_m]
All the best to you 
Thanks for the suggestions! Unfortunately, I’m really loving your suggestions ending in N but they just seem clunky when the first name ends in N.
I’m thinking over [name_m]Linwood[/name_m].
Why not use it as is? Technically it is a unisex name. Historically, before the 20th century, it was used primarily for boys.
Hmm, suppose I could. [name_f]My[/name_f] aunt’s full name is [name_f]Lynett[/name_f]@ but literally no one calls her that, only [name_u]Lyn[/name_u]. And [name_u]Lyn[/name_u] is my middle name. The thought of using it for a boy never occurred to me. Still have the problem of it ending in N though…
How many syllables is the first name? I think both names ending with an n would only really be a problem if they both had the same number of syllables.
I second the idea of [name_u]Lake[/name_u]! The meaning would be tied to your aunt and you as well.
-n [name_u]Lake[/name_u] -s.
I think it would flow well with the first name ending with a n and the last name ending with an S.
Oh, I like that idea! Though, I would feel like she might not even notice the connection. Lol I don’t think she likes her full name very much.
I’m really liking [name_u]Everett[/name_u] as I have a positive association and have seen it a few times in my distant genealogy.
We’re considering [name_m]Watson[/name_m]… [name_m]Watson[/name_m] [name_u]Lyn[/name_u] just doesn’t flow the best.
Harland
Lyndros / Lindros
[name_u]Lynx[/name_u]
[name_u]Lincoln[/name_u]
[name_m]Clint[/name_m]
What about [name_f]Linnet[/name_f]?
It is on my long list for a girl!
Why not for a boy?