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Surname Данай (Danai , Danay , Danaj ) , in the world, is a common last name. The cognomen Данай is habitual in Albania, where it is quite a common surname, Greece, and Nepal, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Greece, India, and Albania. More prevalently, Данай is the forename as well as the last name.