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Last name Petruna (Петруна , Petruna ) , all over the world, is quite a rare cognomen. The family name Petruna is characteristic of Bulgaria, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and Slovakia, where it is a rare surname. Measured by absolute frequency, the name is most common in Bulgaria, the United States, and North Macedonia. Likewise, Petruna is the forename as well as the last name.