Surname ธัญวงศ์ (ธัญวงศ์ 
, Thanyawong , Thunyawong ) , throughout the world, is a rare last name. The last name ธัญวงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ธัญวงศ์ is the forename as well as the last name.