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Surname Vain (Vain , Vein , Вайн ) , in the entire world, is quite a rare cognomen. The surname Vain is habitual in Estonia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Malaysia, where it is a rare surname. In absolute terms, it is the most numerous in India, France, and Estonia. Much less frequently, Vain is the forename as well as the last name.