[name_m]Harrison[/name_m] [name_m]Felix[/name_m], [name_m]Benedict[/name_m] [name_u]Roy[/name_u], [name_m]Frederick[/name_m] [name_u]Luca[/name_u] and [name_m]Sebastian[/name_m] [name_m]Romeo[/name_m]. Not my personal faves from your list, just the ones that I think work the best together in a sibset.
Harrison, [name_m]Ambrose[/name_m], [name_m]Sebastian[/name_m], and [name_m]Benedict[/name_m] …in that order. [name_m]Harrison[/name_m] and [name_m]Ambrose[/name_m], the two elder brothers… And [name_m]Sebastian[/name_m] and [name_m]Benedict[/name_m] (Bash and [name_m]Benny[/name_m]?) the younger two.
Idea: you could definitely try a poll with a pick 4 min/max and see what the votes return!
Ambrose [name_m]Lysander[/name_m], [name_m]Frederick[/name_m] [name_u]Luca[/name_u], [name_m]Sebastian[/name_m] [name_m]Romeo[/name_m] and [name_m]Benedict[/name_m] [name_u]Roy[/name_u]; or
Harrison [name_m]Felix[/name_m], [name_m]Jedidiah[/name_m] [name_m]Gregor[/name_m], [name_m]Sebastian[/name_m] [name_m]Romeo[/name_m] and [name_m]Finnegan[/name_m] [name_u]Seth[/name_u].
I have a hard time seeing [name_m]Ambrose[/name_m] and [name_m]Jedidiah[/name_m] as brothers; otherwise I can mix and match without too much trouble.