Family name Yein (Yein 
, Еин 
) , all over the world, is a common last name. The cognomen Yein is habitual in Myanmar, where it is quite a common surname, Malaysia, where it is quite a rare surname, and South Korea, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Myanmar, India, and Malaysia. Much less frequently, Yein is the forename as well as the last name.