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Cognomen Gualterio (Gualterio
) , around the globe, is a rare last name. The family name Gualterio is habitual in Latin America and the Caribbean, particularly Mexico, where it is a rare surname, Uruguay, and Argentina. Not in comparison with a country's population, it is the most numerous in Mexico, Argentina, and Italy. Likewise, Gualterio is the forename as well as the last name.