Cognomen ส้มเช้ง (Somchao 
, ส้มเช้ง, Somchange) , around the world, is a very rare family name. The last name ส้มเช้ง is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, ส้มเช้ง is the forename as well as the last name.