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Surname Оя (Oja , Оя , 大屋 ) , throughout the world, is a common family name. The cognomen Оя is characteristic of Northern Europe, particularly Estonia, where it is a common surname, Finland, where it is quite a common surname, and Latvia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in India, Estonia, and Finland. Very seldom, Оя is the forename as well as the last name.