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Surname Romualdo (Romualdo , Ромуальд , Ромуальдо ) , around the world, is a common last name. The surname Romualdo is characteristic of Mexico, where it is quite a common surname, Cabo Verde, and Spain, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Mexico, Brazil, and Philippines. Also, Romualdo is the forename as well as the last name.