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Cognomen Koski (Koski , コスキ , كوسكي) , throughout the world, is a common family name. The last name Koski is characteristic of Northern Europe, particularly Finland, where it is a common surname, Estonia, where it is quite a rare surname, and Sweden. Not in comparison with a country's population, it is commonest in Finland, the United States, and Canada. Much less frequently, Koski is the forename as well as the last name.