A brother for Gaspard?

[Lenka24]

Gaspard is going to become a big brother.
Don't know yet if it's a boy or a girl... as the baby is due in february!!
While for a girl we already got a name since a long time, for a boy it appears to be more difficult!!!
We are french living in France (Gaspard = Caspar) but I'm looking for new ideas, that's why I'm trying foreign forums!!

I love lots of names, from various origins... Nikolai, Felix (but got a friend who has a Gaspard and Felix) Oscar (but Gaspard and Oscar too many "ar"?) Marius, Marcus....
Hubby likes Constantin, Samuel...

But can't find THE name!!

I love Gaspard. How about Fabian?

I thought that in France you can only register names on the official lists?

Théodore
Joseph
Sebastien

Quinten? Or the French equivalent not sure how its spelt I really like them together. Quinten and Caspar. But I just changed my daughters name after 8 months so probably not the best person to suggest things!

@Rhubarbgarden, thank you for my son's name! I love it too since a long long long time! I was lucky his dad liked too when I suggested it!!

@Fram, you mean from a calendar?

@TheWoman, I love Theodore, Theophile also... but don't like the nickname Theo (which can be a name too... too many Theo in France!!)
Joseph, unfortunately, my friend who has Gaspard and Felix has a third son... Joseph!!

Don't really like Sebastian and Fabian!

@BeyoncesCat, Quinten is Quentin in France, and it's also my little brother! (and he will be the godfather of this baby!!)

Thank you for your first ideas!

Allard?

Valentin
Otto
Horace
Valerian
Hector

Clement
Blaine
Leo
Lucien
Valentin

*blaise

Auguste?

Laurent
Alexis
Maxence
Etienne
Corentin
Florian
Alexandre
Charles
Louis
Philippe
Thomas
Xavier

Marcel
Michel
Jean
Yves
Xavier
Pierre
Marc
André
Javier
Lucas/Luca
Sebastian
Oscar