Family name สมวงศ์ (สมวงศ์ 
, Somwong 
) , across the world, is quite a common cognomen. The cognomen สมวงศ์ is habitual in Thailand, where it is quite a rare surname, Singapore, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, สมวงศ์ is the forename as well as the last name.