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Globally, Sídnei (Sydney , Sídnei ) is a common unisex forename. The given name Sídnei is habitual in New Zealand, where it is quite a common predominantly masculine, but very seldom feminine name, Antigua and Barbuda, where it is quite a common boy's name, and South Africa (explore the name in all countries). In absolute terms, it most frequently occurs in the United States, South Africa, and the Democratic Republic of the Congo. Much less frequently, Sídnei is the last name as well as the forename.
Sídnei is also a popular name for the fictitious and mythical characters: Sydney Bristow , the fictional character in the television series Alias; Sydney Carton , the Fictional character in Charles Dickens' novel A Tale of Two Cities; Sidney Prescott , the character in the Scream franchise; Sixpack , the DC Comics character, Hitman and Sydney Fox , the fictional character, Relic Hunter, and in many other works.