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Last name Arnaut (Arnaut , Арнаут , Arnavut ) , all over the world, is a common cognomen. The surname Arnaut is habitual in Bosnia and Herzegovina, where it is a common surname, Moldova, where it is quite a common surname, and Serbia, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Bosnia and Herzegovina, Moldova, and Ukraine. Much less frequently, Arnaut is the forename as well as the last name.