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Around the globe, Sī (Se , 斯 , 偲 ) is a widespread epicene first name. The given name Sī is characteristic of India, where it is quite a common largely masculine, but infrequently feminine name, Algeria, where it is quite a rare unisex name, and Tunisia. In absolute terms, the name is most common in India, China, and Egypt. Likewise, Sī is the last name as well as the forename.
Sī is also a name for the fictitious and mythical characters: .