Cognomen สมวัง (Somwang 
, สมวัง ) , all around the world, is quite a rare surname. The family name สมวัง is characteristic of Thailand, where it is quite a rare surname, Malaysia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Thailand, China, and Malaysia. Also, สมวัง is the forename as well as the last name.