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Globally, Sayo (Sayo , サヨ , سايو) is a common unisex first name. The forename Sayo is characteristic of Nigeria, where it is quite a rare gender-neutral name, Mali, where it is a rare male name, and Saudi Arabia, where it is a rare unisex name. Not in comparison with a country's population, this name is the most popular in Nigeria, India, and Indonesia. Likewise, Sayo is the last name as well as the forename.
Sayo is also a name for the fictitious and mythical characters: Sayo Hikawa , the fictional character from BanG Dream!, BanG Dream! Girls Band Party! and Sayo Aisaka , the fictional character from Negima! Magister Negi Magi.