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Family name Pineiro (Piñeiro , Pineiro ) , all over the world, is a common cognomen. The last name Pineiro is habitual in Latin America and the Caribbean, particularly Uruguay, where it is quite a common surname, Puerto Rico, and Argentina (explore the name in all countries). Measured by absolute frequency, the name is most common in Argentina, Spain, and the United States. Much less frequently, Pineiro is the forename as well as the last name.