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Family name Kataja (Kataja , Катая ) , across the world, is quite a rare last name. The cognomen Kataja is characteristic of Northern Europe, particularly Finland, where it is quite a common surname, Estonia, where it is a rare surname, and Sweden. Measured by absolute frequency, it is the most numerous in Finland, India, and the United States. Likewise, Kataja is the forename as well as the last name.