What does Alexander mean?
From Greek 'alexein' (to defend, protect) and 'aner/andros' (man), so 'defender/protector of men'. Note this is strictly 'defender' rather than 'warrior', though its martial fame comes from Alexander the Great.
What does Andrew mean?
Andrew comes from the Greek Andreas, “manly, brave,” from anēr, “man.” Andrew was the first-called of the apostles and is the patron saint of Scotland.