TBH I've mostly given up on having first names for Amis. There's not much point--they all regularly address each other by their last names, and I don't see any real reason to change that, which means first names are irrelevant unless they come up incidentally in the plot. (Being addressed by family members, having one's full name read out for some official purpose, etc.) There's also the fact that for most of them, particularly Enjolras, no one name ever feels right.
...okay, I lied a little. I have a couple of fem versions of Enjolras kicking about in my head/fic--one is actually a trans man, one is crossdressing For The Revolution--and for some reason they were always christened Léonide. I still don't know or particularly care what male first names they adopted though, any more than I know the first names of my bio-male Enjolras figments.
[Dieu] entend ta voix, ô fille des hommes! aussi bien que celle des constellations; car rien n'est petit pour celui devant lequel rien n'est grand.
- George Sand, Les sept cordes de la lyre