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Surname ธัญวุฒิ (ธัญวุฒิ , Tanyawut , Tanyawuth ) , throughout the world, is a very rare last name. The surname ธัญวุฒิ is characteristic of Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. More prevalently, ธัญวุฒิ is the forename as well as the last name.