Family name Eui (Eui 
) , throughout the world, is a rare last name. The surname Eui is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Myanmar, where it is a very rare surname, and Indonesia. Not in comparison with a country's population, this name is the most popular in China, Indonesia, and Malaysia. More frequently, Eui is the forename as well as the last name.