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Surname Piskar (Piskar , Пискарь ) , across the world, is a rare cognomen. The last name Piskar is characteristic of Southern Europe, particularly Slovenia, where it is quite a rare surname, Croatia, where it is a very rare surname, and Greece. Not in comparison with a country's population, this name is the most popular in Slovenia, Russia, and Germany. Much less frequently, Piskar is the forename as well as the last name.