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Globally, 索 (索 , Seu , Thow ) is quite a rare unisex first name. The given name 索 is characteristic of Nigeria, where it is a rare boy's name, China, where it is a rare epicene name, and Italy. In absolute terms, the name is most common in China, India, and Nigeria. More prevalently, 索 is the last name as well as the forename.
索 is also a name for the fictitious and mythical characters: Seu Creysson , character in Casseta & Planeta.