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Family name Musao (Musao ) , around the world, is a rare surname. The surname Musao is habitual in the Democratic Republic of the Congo, where it is a rare surname, Philippines, where it is a very rare surname, and South Africa, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in the Democratic Republic of the Congo, Philippines, and Nigeria. Much less frequently, Musao is the forename as well as the last name.