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Cognomen Gullo (Gullo , 古洛 , Гулло ) , in all the world, is a common family name. The last name Gullo is characteristic of Italy, where it is quite a rare surname, Switzerland, and Argentina. Not in comparison with a country's population, it is the most numerous in Italy, the United States, and Argentina. Also, Gullo is the forename as well as the last name.