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Surname Dumm (Dum , Dumb , 达姆 ) , across the world, is quite a common cognomen. The family name Dumm is characteristic of Guinea-Bissau, where it is quite a rare surname, Venezuela, and Austria. Not in comparison with a country's population, it is the most numerous in the United States, India, and Indonesia. Also, Dumm is the forename as well as the last name.