I like the previous suggested [name_f]Coralie[/name_f] and [name_f]Cleo[/name_f].
Other suggestions:
-Ocean
-Dylan
-Marley
-Marion
-Mira
-Nori
-Uma
I love sisters [name_m]Luca[/name_m] and [name_f]Sunny[/name_f] with brother [name_m]Hudson[/name_m]! They all have a fresh, bright, nature-leaning theme. And as others have mentioned, I’d avoid anything too feminine for Luca’s sister, and the names like [name_m]River[/name_m] and [name_m]Harbor[/name_m] with [name_m]Hudson[/name_m] are too reminiscent of bodies of water imo. Honorable mention to [name_m]Rory[/name_m] and maybe [name_f]Reese[/name_f]!
Congratulations! Great name options. I would steer away from [name_f]Bay[/name_f] and [name_m]River[/name_m] because of the name [name_m]Hudson[/name_m]. Maybe more subtle but still unique coastal names like Maren/Marin, [name_f]Marina[/name_f], [name_f]Maris[/name_f], or [name_f]Marley[/name_f] could work for both of you. For more word-type names maybe Sailor/Saylor, [name_m]Cove[/name_m], or [name_f]Lake[/name_f]. Good luck!
[name_m]Luca[/name_m] for a girl is an interesting choice, [name_m]Hudson[/name_m] is sweet for a boy, here’s some unique coastal-ish names for consider…
[name_m]Hudson[/name_m] as in [name_m]River[/name_m]
[name_f]Saylor[/name_f] as in the [name_f]Sea[/name_f]
[name_f]Isla[/name_f] as in an [name_f]Island[/name_f]
I think they sound absolutely adorable together. Some middle names could be;
[name_m]Hudson[/name_m] [name_m]Rory[/name_m], [name_f]Saylor[/name_f] [name_f]Maeve[/name_f] & [name_f]Isla[/name_f] [name_f]Quinn[/name_f]
[name_m]Hudson[/name_m] [name_m]Rory[/name_m], [name_f]Saylor[/name_f] [name_f]Raine[/name_f] & [name_f]Isla[/name_f] [name_f]Rue[/name_f]
Coastal/Water themed first names and [name_m]Irish[/name_m] middle names to link all three together, or all R middle names!