I like Declan out of all of the choices.
My favorite is Fraser for boys but I think Declan meshes better. (You already have two -er boys and on -n boy. For me Declan is a better balance.)
I really like Declan Stanley or Declan Arthur
Also while I love the Indy Summer suggestion above I keep thinking about the term Indian Summer when I read it. -> not necessarily a bad thing, just a thing. I have the same issues with Alaska Skye, just too descriptive for me.
I'd probably use Daisy as a FN for a girl. Daisy Jessica or Daisy Skye.
I would pick Declan personally!