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Family name Kosowski (Kosowski , Cososchi , Косовский ) , across the world, is quite a rare cognomen. The surname Kosowski is characteristic of Poland, where it is quite a rare surname, Israel, and Romania, where it is a rare surname. Not in comparison with a country's population, the name is most common in Poland, the United States, and Russia. Likewise, Kosowski is the forename as well as the last name.