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Surname Grimaldi (Grimaldi , غريمالدي , Грималди ) , all around the world, is a common last name. The surname Grimaldi is characteristic of Monaco, where it is a common surname, Italy, where it is quite a common surname, and El Salvador. Not in comparison with a country's population, this name is the most popular in Italy, the United States, and France. Very seldom, Grimaldi is the forename as well as the last name.