Where does “Ancônitain” come from?

Ancônitain (French) comes from Latin Ancōnitānus, from Latin ancōn, from Ancient Greek ἀγκών, from Ancient Greek γωνία, from Ancient Greek γόνυ, from Proto-Hellenic gónu, from Proto-Indo-European ǵónu — knee.

Ancônitain (French): Anconitan, Anconan