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Last name Guadamuz (Guadamuz ) , in all the world, is a common family name. The last name Guadamuz is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a common surname, Costa Rica, where it is quite a common surname, and Panama, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Nicaragua, Costa Rica, and the United States.