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Last name Genao (Genao ) , in all the world, is a common family name. The family name Genao is characteristic of Latin America and the Caribbean, particularly the Dominican Republic, where it is quite a common surname, Puerto Rico, where it is quite a rare surname, and Panama. Measured by absolute frequency, it is commonest in the Dominican Republic, the United States, and Panama. Much less frequently, Genao is the forename as well as the last name.