Altair does NOT mean "son of none." Whoever said this is most likely basing it off the character Altair ibn La-Ahad from the video game, Assassin's Creed. The latter part of the character's name means "son of none." Altair means either "the bird," "the flying one," or a variation of the two.
-- Anonymous User 6/13/2008
The name can also be spelt "Altaïr" or "Atair", which is Arabic for "the bird", from the phrase الطير.