I think we are almost there with a third boys name to go with [name_m]Lachlan[/name_m] and [name_m]Hugo[/name_m].
Our shortlist is now:
[name_m]Lachlan[/name_m], [name_m]Hugo[/name_m] and [name_m]Angus[/name_m] (potentially shortened to Gus)
[name_m]Lachlan[/name_m], [name_m]Hugo[/name_m] and [name_m]Ralph[/name_m]
[name_m]Lachlan[/name_m], [name_m]Hugo[/name_m] and [name_u]Owen[/name_u]
I like [name_m]Angus[/name_m] and Owen; [name_m]Ralph[/name_m] I’m not a fan of due to its slang meaning (but that may not apply to you depending on where you are).
With the brothers, [name_m]Angus[/name_m] reads very Scottish when paired with [name_m]Lachlan[/name_m], with [name_m]Hugo[/name_m] as a bit of an outlier - but I think it still works. [name_m]Hugo[/name_m] and [name_u]Gus[/name_u] are a little toungue-twisty to me, but not excessively so.
[name_u]Owen[/name_u] takes the set in more of a neutral direction, but it does share an ending with [name_m]Lachlan[/name_m], and its starting O is the same as Hugo’s ending o. These are not huge issues, so if you love it, go for it.
[name_m]Ralph[/name_m] is my personal favorite of the three, but I think it would be a bit of an outlier in your set. I think I like [name_m]Angus[/name_m] better for you!
[name_u]Owen[/name_u] and [name_m]Angus[/name_m] would be my top 2 ! I think I slightly prefer [name_m]Angus[/name_m] with [name_m]Hugo[/name_m] and [name_m]Lachlan[/name_m]
[name_m]Angus[/name_m] nn [name_u]Gus[/name_u] is my fave absolutely! Both considering brothers’ names and just thinking of what I like best. So strong and gorgeous.