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Family name Sidu (Sidu , سيدو ) , in the entire world, is a common surname. The family name Sidu is habitual in Western Asia, particularly Syria, where it is quite a common surname, Lebanon, where it is quite a rare surname, and Jordan. Measured by absolute frequency, it is the most numerous in India, Syria, and South Africa. Also, Sidu is the forename as well as the last name.