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Surname Fost (อุปถัมภ์ , Fost , Фост ) , in the entire world, is quite a rare family name. The last name Fost is habitual in Thailand, where it is quite a rare surname, Slovenia, where it is a rare surname, and Netherlands. Measured by absolute frequency, it most frequently occurs in Thailand, the United States, and Russia. Much less frequently, Fost is the forename as well as the last name.