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Surname Sumpter (Sagma , Sumpter , サンプター) , all over the world, is quite a common cognomen. The family name Sumpter is characteristic of the United States, where it is quite a rare surname, Puerto Rico, and the United Kingdom, where it is a rare surname. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and India. Much less frequently, Sumpter is the forename as well as the last name.