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Cognomen Somarriba (Somarriba ) , in the entire world, is quite a common last name. The surname Somarriba is habitual in Latin America and the Caribbean, particularly Nicaragua, where it is quite a common surname, Panama, where it is quite a rare surname, and Costa Rica. Measured by absolute frequency, it most frequently occurs in Nicaragua, the United States, and Mexico. Very seldom, Somarriba is the forename as well as the last name.