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Last name Conno (Conno , Cunno , Cunnus ) , all around the world, is a rare surname. The family name Conno is habitual in Ireland, where it is a rare surname, Australia, where it is a very rare surname, and Italy. Not in comparison with a country's population, it is commonest in Nigeria, Italy, and the United States. Also, Conno is the forename as well as the last name.