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Cognomen Zeleznik (Zeleznik ) , in all the world, is quite a rare last name. The cognomen Zeleznik is characteristic of Slovenia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Israel. Measured by absolute frequency, the name is most common in Slovenia, the United States, and Slovakia. Much less frequently, Zeleznik is the forename as well as the last name.