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In all the world, サイム (Sime , Syme , サイム ) is a common boy's first name. The given name サイム is habitual in Ethiopia, where it is quite a common masculine name, Morocco, where it is quite a rare predominantly male, but very infrequently girly name, and North Macedonia, where it is quite a rare masculine name. Measured by absolute frequency, it is commonest in Ethiopia, Morocco, and India. Likewise, サイム is the last name as well as the forename.
サイム is also a name for the fictitious and mythical characters: Syme , the mythological Greek character; Syme , the operatic character in the opera 1984 and Syme , the fictional character in George Orwell's novel Nineteen Eighty-Four.