From your new shortlist, I still love Cyprian, of course. Ambrose is one of my all-time favorites, but I'm not sure you want it with Antoine. Raoul I would never have thought of, but it's pretty cool and goes well with Antoine. I really like Raoul Aurelian somehow. Blaise I can't get behind; reminds me of blase. Leander has an impressive ancient pedigree. Victor is good too, especially with Antoine. But then I would go with Ignatius for the mn rather than Aurelian (which is too imperial).
Lots of great options, Blade, and of course you have lots of time to ponder them.
Blade, I just replied on your girl thread (so late!) and I hope you see this one, too.
From your first name list I like these the most with Antoine:
My favorite by far is Cyprian Ignatius, which I see at least one other person suggested. As you know, we were strongly considering Ignacio if Inés had been a boy, and the name Ignatius has really been growing on me. I think it should be considered for a first name as well, with Antoine. Antoine and Ignatius would be awesome for brothers.
Cyprian Ignatius and Antoine Raphael
Ignatius Leander and Antoine Raphael
Leander Ignatius and Antoine Raphael
Marius Esmond and Antoine Raphael
Raoul Ignatius and Antoine Raphael