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Across the world, Sî (Sî ) is quite a rare gender-neutral given name. The forename Sî is characteristic of Northern Africa, particularly Algeria, where it is quite a rare epicene name, Tunisia, and Morocco, where it is quite a rare dominantly boy's, but infrequently female name. Much less frequently, Sî is the last name as well as the forename.
Sî is also a name for the fictitious and mythical characters: .