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.