Where does “Sandoy” come from?

Sandoy (Faroese) comes from Faroese Sandur, from Faroese Aleksandur, from Latin Alexander, from Ancient Greek Ἀλέξανδρος, from Ancient Greek ἀλέξω, from Ancient Greek ἀνδρός, from Ancient Greek ἀνήρ, from Proto-Hellenic *anḗr — man.