I love
Isidore on a girl too. I think it's obscure enough nowadays that someone could do it without people making much of a fuss. I love
Jules and
Valentine on boys and I think they'd be gorgeous as a sibset, ah!!
Jules,
Valentine and
Noël would be lovely. One thing though - I'm guessing that since you include the diacritical mark, the pronuncian would be "no ELL" as opposed to "nole", is that right?
Hmm some of my fave non binary ideas are:
Ailbhe (I like both the pronunciation "
Albie" and "
Alva")
Amor (very cheesy I know)
True
Aspen (apparently this is only feminine but it works fine on a boy for me....)
CloverEnitanEvrenTierneyDarbySparrowAmery
I also like some old fashioned/less common names that are technically not nonbinary but I think they'd work:
WilmotKestrelJolyonMeritScout (this seems like such a boy name to me)
AmabelJonquilMerrynNinianSenecaAfonWynn or
WynneCymbelineSylvainYves (this is not that obscure but I still love this idea)