Cognomen Yyi (Yyi 
) , in the entire world, is a rare family name. The family name Yyi is characteristic of South-eastern Asia, particularly Myanmar, where it is a rare surname, Thailand, where it is a very rare surname, and Malaysia. Not in comparison with a country's population, it is commonest in Myanmar, India, and Thailand. Much less frequently, Yyi is the forename as well as the last name.