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Cognomen Kollar (Kollár , Kollar , كولار ) , worldwide, is a common last name. The family name Kollar is habitual in Eastern Europe, particularly Slovakia, where it is a common surname, Hungary, where it is quite a common surname, and Czechia, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Slovakia, Hungary, and the United States. Much less frequently, Kollar is the forename as well as the last name.