Last name อื่น (Uen 
, อื่น) , across the world, is a rare surname. The cognomen อื่น is characteristic of Laos, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it is commonest in China, Indonesia, and Laos. Likewise, อื่น is the forename as well as the last name.