Cognomen อ่อนดำ (Ondam 
, อ่อนดำ) , in the world, is a rare family name. The cognomen อ่อนดำ is habitual in Thailand, where it is a rare surname, Philippines, where it is a very rare surname, and India, where it is an extremely rare surname. Very seldom, อ่อนดำ is the forename as well as the last name.