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Throughout the world, 席德 (Sid , Syd , 席德 ) is a common predominantly boy's, but very infrequently girly forename. The forename 席德 is habitual in Algeria, where it is quite a common principally male, but very infrequently girly name, Mauritania, where it is quite a common gender-neutral name, and Mauritius, where it is quite a rare boy's name. Measured by absolute frequency, this name is the most popular in Algeria, the United States, and India. Also, 席德 is the last name as well as the forename.
席德 is also a prevalent name for the fictitious and mythical characters: Sid , the Ice Age character, Ice Age: Collision Course; Sid Jenkins , the character in Skins; Sid Phillips , the Toy Story character; Sid Hammerback , the fictional character, CSI: NY and Sid Vacant , the one of the protagonists of 1997 video games Grand Theft Auto: London 1969 and Grand Theft Auto: London 1961, and in many other works.