Last name Iyn (Iyn 
) , in the world, is a rare cognomen. The family name Iyn is characteristic of Taiwan, where it is quite a rare surname, South Korea, where it is a rare surname, and Myanmar, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Taiwan, South Korea, and Indonesia. Very seldom, Iyn is the forename as well as the last name.