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Surname Cogo (Cogo ) , throughout the world, is a common family name. The last name Cogo is characteristic of U.S. Virgin Islands, where it is quite a common surname, Eswatini, and Bosnia and Herzegovina, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Brazil, Italy, and Argentina. Much less frequently, Cogo is the forename as well as the last name.