It's interesting, I'm French and there was a time I was also trying to find names that would be easily usable in both countries without being to generic either.
So my rating will be based on the correct pronounciation, but it probably wouldn't be the same if I were American...
Marieve* - 4
Bérengère* - 7
Ombeline* - 9 (I
LOVE Ombeline! It's on my PNL)
Aubeline - 5
Nadège - 4
Mazarine* - 7 Classy, I did't know the meaning, thanks.
Josiane* - 3 I'm not a fan but it would be the easiest out of this list in my opinion.
*
Argider - 2 ...It doesn't really bring images to my mind except that I make it rhyme with frigidaire, I find it hard to rate it. I don't find it very feminine either.
What about for example
Oriane / Auriane, Ophélie,
Faustine, Geneviève, Héloïse,
Flora...?