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In the world, サイ (Sai , Sie , Cy ) is a widespread largely male, but seldom female forename. The first name サイ is habitual in Eastern Asia, particularly Mongolia, where it is a prevalent boy's name, Hong Kong, where it is quite a common gender-neutral name, and Macao, where it is quite a common mostly male, but uncommonly female name (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in India, Mongolia, and Indonesia. Much less frequently, サイ is the last name as well as the forename.
サイ is also a name for the fictitious and mythical characters: Sai , the fictional character from Naruto; Sie Kensou , the fictional character from Psycho Soldier and The King of Fighters, The King of Fighters XIII; Cy the Cardinal , the Mascot of Iowa State University; Sai , the Name of protagonist in Telugu movie Snehituda... and Sai Jōnouchi , among other works.