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Family name Lacko (Lacko , Lackó , لاكو ) , around the world, is quite a common last name. The cognomen Lacko is habitual in Slovakia, where it is quite a common surname, Croatia, and Czechia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Slovakia, Czechia, and the United States. Very seldom, Lacko is the forename as well as the last name.