Surname Muen (沐恩 
, หมืน 
, Muen 
) , in all the world, is a rare family name. The family name Muen is characteristic of Malaysia, where it is a rare surname, Australia, where it is a very rare surname, and Thailand. Measured by absolute frequency, it most frequently occurs in Malaysia, China, and Indonesia. More frequently, Muen is the forename as well as the last name.