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Cognomen Nag (Nag , ナグ , Наг ) , across the world, is a widespread surname. The cognomen Nag is habitual in India, where it is quite a common surname, Bangladesh, where it is quite a rare surname, and Norway. Not in comparison with a country's population, it is the most numerous in India, Bangladesh, and Myanmar. Much less frequently, Nag is the forename as well as the last name.