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Globally, Sì (嗣 , 似 , Sì ) is quite a rare gender-neutral first name. The forename Sì is habitual in Northern Africa, particularly Algeria, where it is a rare unisex name, Tunisia, where it is a rare female name, and Morocco, where it is a rare largely masculine, but seldom girly name. Not in comparison with a country's population, it most frequently occurs in China, Algeria, and Morocco. More prevalently, Sì is the last name as well as the forename.
Sì is also a name for the fictitious and mythical characters: Sì , the operatic character in the opera Sì by null; an actress at the Folies Bergère.