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Family name Sosnowski (Sosnowski , Сосновский , Сосновський ) , all around the world, is a common cognomen. The family name Sosnowski is habitual in Poland, where it is quite a common surname, Belarus, and Bosnia and Herzegovina, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Poland, Russia, and Ukraine. Also, Sosnowski is the forename as well as the last name.