Surname อรอินทร์ (Onin 
, อรอินทร์ , Ornin 
) , all around the world, is quite a rare family name. The family name อรอินทร์ is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, Philippines, where it is a rare surname, and Malaysia. In absolute terms, the name is most common in Thailand, Philippines, and Bangladesh. Likewise, อรอินทร์ is the forename as well as the last name.