Last name อจ (Ot 
, อจ 
, Achamana 
) , worldwide, is a common surname. The surname อจ is characteristic of Mongolia, where it is quite a common surname, Saudi Arabia, where it is quite a rare surname, and Botswana. Not in comparison with a country's population, it is the most numerous in Mongolia, Saudi Arabia, and Turkey. Much less frequently, อจ is the forename as well as the last name.