Family name แสงวรรณ (Sangwan 
, แสงวรรณ , Sangwarn ) , in the world, is quite a common surname. The last name แสงวรรณ is habitual in Thailand, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and Oman. In absolute terms, it is commonest in India, Thailand, and the United States. Very seldom, แสงวรรณ is the forename as well as the last name.