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Worldwide, Айн (Ain , Ayn , Ayne ) is a common epicene first name. The forename Айн is characteristic of Brunei, where it is quite a common girly name, Aruba, and Estonia, where it is quite a rare masculine name. Not in comparison with a country's population, the name is most common in Pakistan, Indonesia, and India. Likewise, Айн is the last name as well as the forename.