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Family name Sayi (Sayi ) , around the world, is a common cognomen. The last name Sayi is habitual in Sub-Saharan Africa, particularly Tanzania, where it is quite a common surname, the Democratic Republic of the Congo, where it is quite a rare surname, and Zimbabwe. Not in comparison with a country's population, it is commonest in Tanzania, the Democratic Republic of the Congo, and Turkey. Also, Sayi is the forename as well as the last name.