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Last name Ойя (Oja , Ojja , Oyya ) , around the globe, is a common cognomen. The last name Ойя 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. In absolute terms, it most frequently occurs in India, Estonia, and Finland. Much less frequently, Ойя is the forename as well as the last name.