Bruce is the name of the Great White Shark who is the main antagonist of the Jaws franchise. He appears as the main antagonist of the first Jaws film, and the posthumous overarching antagonist of the rest of the franchise. He was the collective name for a reoccurring group of overgrown Great White Sharks thought to be closely related genetically, however, neither the film nor the novel ever refers to any of the sharks by a particular name. The name Bruce originates from the name given to the original animatronics by Steven Spielberg.

Source: Fandom