Cognomen ยาด (Yat 
, ยาด 
, Yadd 
) , in all the world, is a common surname. The surname ยาด is habitual in Guatemala, where it is quite a common surname, Hong Kong, where it is quite a rare surname, and Malaysia. Not in comparison with a country's population, the name is most common in Guatemala, Indonesia, and Malaysia. Very seldom, ยาด is the forename as well as the last name.