Surname Saeun (Saeun 
, แซ่อุน, แซ่อุ่น) , across the world, is a rare cognomen. The cognomen Saeun is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Indonesia, where it is a very rare surname, and Cambodia. In absolute terms, it most frequently occurs in Thailand, Indonesia, and the United States. Likewise, Saeun is the forename as well as the last name.