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Surname Thammasat (ธรรมศาสตร์ , Thammasat , ทองธรรม ) , in the world, is a rare last name. The surname Thammasat is characteristic of Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Likewise, Thammasat is the forename as well as the last name.