Last name Ajuin (Ayun 
, Ajuin , Oignon 
) , in the entire world, is quite a common surname. The family name Ajuin is characteristic of Indonesia, where it is quite a rare surname, Malaysia, and Saudi Arabia, where it is a rare surname. In absolute terms, this name is the most popular in South-eastern Asia, particularly Indonesia, Malaysia, and Philippines. Also, Ajuin is the forename as well as the last name.