Last name Айн (Ain 
, Ayn , Ayne 
) , worldwide, is a common cognomen. The cognomen Айн is characteristic of South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, and Singapore, where it is quite a rare surname. In absolute terms, this name is the most popular in Malaysia, Pakistan, and Indonesia. Also, Айн is the forename as well as the last name.