Where does “αλλοδαπός” come from?

αλλοδαπός (Greek) comes from Ancient Greek ἀλλοδαπός, from Ancient Greek ἄλλος, from Ancient Greek κρίνω, from Proto-Hellenic kríňňō, from Proto-Indo-European krinyéti, from Proto-Indo-European krey- — to sift, separate, divide.

αλλοδαπός (Greek): alien, foreign; alien, foreigner