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All over the world, ไส้ (Sai , ไส้, Fillingam) is a widespread dominantly male, but seldom girly given name. The given name ไส้ is characteristic of Mongolia, where it is a prevalent masculine name, India, where it is quite a common gender-neutral name, and Macao, where it is quite a common dominantly male, but seldom feminine name (explore the name in all countries). In absolute terms, it is the most numerous in India, Mongolia, and Myanmar. Much less frequently, ไส้ is the last name as well as the forename.
ไส้ is also a name for the fictitious and mythical characters: Sai , the fictional character from Naruto; Sai , the Name of protagonist in Telugu movie Snehituda... and Sai Jōnouchi .