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Surname Казлоў (Kozlov , Казлоў ) , around the world, is a common last name. The cognomen Казлоў is habitual in Estonia, where it is quite a common surname, Belarus, where it is quite a rare surname, and Lithuania. Not in comparison with a country's population, it most frequently occurs in Russia, Belarus, and the United States. Much less frequently, Казлоў is the forename as well as the last name.