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Surname Siby (Siby ) , in the entire world, is a common last name. The last name Siby is habitual in Sub-Saharan Africa, particularly Mali, where it is quite a common surname, Senegal, and Gabon, where it is quite a rare surname. In absolute terms, it is commonest in Mali, Senegal, and India. Also, Siby is the forename as well as the last name.