How about
René? I love it. It works in all three languages and is not as common as it used to be.
Others that might work:
GabinHector /
HéctorJulienPascal /
Pascual (if you ignore the
Easter meaning)
NestorQuentinGaston /
GastónTadeo
I also like
Silvester and
Lucien as others have suggested.
