Surname ปิยะวงศ์ (ปิยะวงศ์ 
, Piyawong 
, Pichawong ) , across the world, is quite a rare last name. The surname ปิยะวงศ์ is habitual in Laos, where it is quite a rare surname, Thailand, where it is a rare surname, and Finland. Very seldom, ปิยะวงศ์ is the forename as well as the last name.