Cognomen Nayn (Nayn 
, Наин 
, Найн 
) , all over the world, is a rare last name. The family name Nayn is habitual in Kazakhstan, where it is a rare surname, Kyrgyzstan, and Myanmar. Measured by absolute frequency, this name is the most popular in Kazakhstan, Russia, and Myanmar. Also, Nayn is the forename as well as the last name.