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Family name سيدي (Sidi , Sidy , Seydi ) , across the world, is a widespread last name. The cognomen سيدي is habitual in Mauritania, where it is a common surname, Senegal, and Iran, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, the name is most common in Iran, Senegal, and Nigeria. Also, سيدي is the forename as well as the last name.