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Family name ธรรมวัฒน์ (ธรรมวัฒน์ , Thammawat , Tammawat ) , throughout the world, is a rare cognomen. The cognomen ธรรมวัฒน์ is characteristic of Thailand, where it is a rare surname, and Denmark. Likewise, ธรรมวัฒน์ is the forename as well as the last name.