Last name Yoeun (Yoeun 
, ยูน ) , in the world, is a rare surname. The last name Yoeun is characteristic of South-eastern Asia, particularly Cambodia, where it is a rare surname, Malaysia, and Thailand, where it is a very rare surname. Not in comparison with a country's population, it is commonest in the United States, Thailand, and Malaysia. Likewise, Yoeun is the forename as well as the last name.