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Last name Mountain (Mountain , ภูผา , マウンテン ) , throughout the world, is quite a common family name. The cognomen Mountain is characteristic of Guernsey, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Botswana. Measured by absolute frequency, this name is the most popular in the United Kingdom, the United States, and Thailand. Much less frequently, Mountain is the forename as well as the last name.