Where does “identitaire” come from?

identitaire (French) comes from French identité, from Latin identitas, from Latin idem, from Proto-Italic izdim.

Ancestry of “identitaire”, step by step

Step	Language	Word	Meaning
1	French	identité	identity
2	Latin	identitas	sameness, identity
3	Latin	idem	the same
4	Proto-Italic	izdim	—

identitaire — Etymology, Origin & Word History | Etymology Explorer