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Around the world, 西耶 (Sie , 西耶 ) is quite a common gender-neutral forename. The first name 西耶 is characteristic of Indonesia, where it is quite a rare gender-neutral name, Ghana, where it is quite a rare boy's name, and Singapore, where it is a rare gender-neutral name. Not in comparison with a country's population, it is commonest in Indonesia, India, and Ghana. Likewise, 西耶 is the last name as well as the forename.
西耶 is also a name for the fictitious and mythical characters: Sie Kensou , the fictional character from Psycho Soldier and The King of Fighters, The King of Fighters XIII.