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Family name Buth (Bud , Buth ) , all over the world, is a common cognomen. The last name Buth is habitual in Mongolia, where it is quite a common surname, Romania, and Lithuania, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in India, Romania, and the United States. Likewise, Buth is the forename as well as the last name.