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Family name ปิยะพันธุ์ (Piyapan , Piyaphan , ปิยะพันธุ์ ) , around the world, is a rare surname. The cognomen ปิยะพันธุ์ is habitual in Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. More prevalently, ปิยะพันธุ์ is the forename as well as the last name.