Family name Yuin (Yuin 
, 유인 
, Юин 
) , worldwide, is quite a rare last name. The last name Yuin is habitual in South-eastern Asia, particularly Malaysia, where it is quite a rare surname, Singapore, where it is a rare surname, and Myanmar. Measured by absolute frequency, the name is most common in South-eastern Asia, particularly Malaysia, Myanmar, and Thailand. Very seldom, Yuin is the forename as well as the last name.