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In the entire world, سيو (Siu , Seo , Sio ) is a common epicene first name. The first name سيو is habitual in Eastern Asia, particularly Macao, where it is quite a common epicene name, Hong Kong, and South Korea, where it is quite a rare feminine name. In absolute terms, it is commonest in Hong Kong, Indonesia, and China. Also, سيو is the last name as well as the forename.
سيو is also a name for the fictitious and mythical characters: Sio Bibble , the Star Wars character, Star Wars: Episode I – The Phantom Menace and Sio Kusunoki , the virtual YouTube personality.