Cognomen เย้ย (Yoei 
, Yey 
, Ridthee 
) , in the entire world, is a rare last name. The cognomen เย้ย is characteristic of Myanmar, where it is a rare surname, the Dominican Republic, and Malaysia. Not in comparison with a country's population, it is the most numerous in Myanmar, Indonesia, and Japan. More frequently, เย้ย is the forename as well as the last name.