In Anthony Burgess' 'A Clockwork Orange', the teenage protagonist is Alex.
Alex narrates the novel and leads a gang of teenage friends, whom he calls his “droogs.” He lives in a near-future dystopian England and spends his nights pursuing “ultra-violence”—robbery, assault, and other acts of brutality—while listening to classical music, especially Beethoven. His narration uses Nadsat, an invented slang influenced heavily by Russian words and teenage speech.
The novel's central conflict begins when the state tries to reform Alex through the Ludovico Technique. Doctors expose him to violent films while drugs make him physically ill, conditioning him to associate violence with nausea. Burgess uses Alex's treatment to ask whether a person is genuinely moral when the ability to choose evil has been removed.
Readers sometimes remember the film's full name, Alexander DeLarge, and assume the novel gives the same surname. In Burgess's book, Alex's surname is not stated. The film, directed by Stanley Kubrick and starring Malcolm McDowell, adds or implies different naming details. Pete, Dim, and Georgie are members of Alex's gang, not alternative names for the protagonist.