I LOVE your naming style! I think it’s pretty similar to mine.
I love [name_u]Hayes[/name_u] , [name_u]Brooks[/name_u] and [name_m]Wells[/name_m] with your boys.
I will suggest a D name to bridge C D E
Deacon / [name_u]Declan[/name_u] ( I am bias as I have used one of these names )
Davis - 5 letters so than you would have a 5,6,7 letter name theme
Other names I love with your sibling set and I apologize if they are already mentioned