Where does “Ἀλέξανδρος” come from?

Ἀλέξανδρος (Ancient Greek) comes from Ancient Greek ἀλέξω, from Ancient Greek ἀνδρός, from Ancient Greek ἀνήρ, from Proto-Hellenic *anḗr — man.

Ἀλέξανδρος (Ancient Greek): Alexander