I love [name_m]Nash[/name_m] as a nickname for [name_m]Nathaniel[/name_m], [name_m]Nathaniel[/name_m] [name_u]Dean[/name_u] or [name_m]Nathaniel[/name_m] [name_m]David[/name_m] would be nice?
[name_u]Lincoln[/name_u] is my favorite from your shortlist with [name_u]Hudson[/name_u]. [name_u]Hudson[/name_u] and [name_u]Oliver[/name_u] as siblings remind me of the actor [name_u]Oliver[/name_u] [name_u]Hudson[/name_u]. Not necessarily a deal breaker, but something to consider.