First, I wanted to say that I [name_u]LOVE[/name_u] so many of your choices. With our last baby, my husband had a breakthrough imagining taking our new baby around the office and introducing him/her, and his favorite boy name became immediately clear to him. Of course we had a girl lol, but a similar exercise might give you guys some clarity for narrowing down.
[name_m]Aldo[/name_m]–Not my favorite from you list.
[name_m]Jasper[/name_m]-- Really handsome! I’m jaded from nameberry because I see this name all the time on here but I’ve never met a [name_m]Jasper[/name_m] irl, so I have a skewed sense of its popularity.
[name_m]Leopold[/name_m]–my FAVE long form of [name_m]Leo[/name_m] but my husband vetoed because he said we were having a little Canadian not a [name_m]French[/name_m] nobleman.
[name_m]Lincoln[/name_m]–[name_u]Love[/name_u] [name_m]Lincoln[/name_m]. [name_u]Love[/name_u] the nickname [name_m]Link[/name_m]. My only concern is compared with other names on this list, it’s more on the popular side which could be a drawback for you.
[name_m]Simon[/name_m]–[name_u]Love[/name_u] it! It sounds sweet, strong, and smart to me. It was on our list. I wish it had a nicer intuitive nickname but nn develop so organically that wasn’t a deal breaker for me.
[name_m]Truman[/name_m]–I really like it! I think it hits a lot of sweet spots: it’s uncommon but familiar, easy to spell and pronounce. I am on the fence about the nickname [name_u]True[/name_u] but I think I ultimately feel positive about it.
[name_m]Walden[/name_m]–I really like it but I’m also a big fan of the transcendentalists. I think it’s a handsome, uncommon choice.
[name_u]Wallace[/name_u]–I like it but I don’t like [name_u]Wally[/name_u]. I’ve seen [name_m]Ace[/name_m] suggested as a nickname for [name_u]Wallace[/name_u], which could be cool.
[name_m]Walter[/name_m]–I like [name_m]Walter[/name_m] but prefer [name_m]Walden[/name_m] and [name_u]Wallace[/name_u]. I don’t like [name_m]Walt[/name_m] or [name_u]Wally[/name_u] as possible nicknames.
Your list also made me think of [name_m]Arthur[/name_m], [name_u]Alden[/name_u], [name_m]Wesley[/name_m], and [name_m]Warren[/name_m]–not that you need more options lol! Good luck!