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Last name Rudan (Rudan , 茹丹 , Рудан ) , all around the world, is quite a rare surname. The surname Rudan is characteristic of Southern Europe, particularly Croatia, where it is quite a common surname, Bosnia and Herzegovina, where it is quite a rare surname, and Serbia. Not in comparison with a country's population, the name is most common in Croatia, Serbia, and Ukraine. More prevalently, Rudan is the forename as well as the last name.