I love a lot of your choices here!
Isaac Theodore is a great pairing!
I also love
Vincent,
Jude and
Raphael.
From your girls list, I love
Isobel. It's on our short list, as is
Cecilia (though we will spell it
Cecelia after my g.grandmother.)
I also love
Fiona and
Stella-- considered them for the short list-- and
Lily and
Clementine.
I used to think
Lily Clementine would be the absolute perfect name, but my DH doesn't like babies to share their names with plants or objects, I guess! It is lovely, though!