I know
Henry and
Harry (
Harrison) are stand alone names now, but it's a bit odd to have them together in the sib set.
Moreover
Henry is the only name, that wasn't derived from a surname.
So, I think
Howard,
Hudson,
Harrison and
Hardy look better, IMHO.
(I stole Howard from your set) Mine quads:
AlexanderLionel MatiasNathan