What does Nicholas mean?
Nicholas comes from the Greek for “victory of the people.” St Nicholas, a 4th-century bishop famed for secret gift-giving, became the model for Santa Claus.
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.