Nintendo scrupulously avoids giving Mario a last name in its games or official materials. However, in the live action movie Super Mario Bros. (1993), Mario's surname is also Mario. When a policemen asks their names, Luigi (John Leguizamo) says his name is Luigi Mario and Mario (Bob Hoskins) says his is Mario Mario.
* In "Paper Mario : The Thousand-Year Door", they say that Mario's Wrestling name is "The Great Gonzalez" (a pseudonym).
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Mario (luigi's last name is also Mario. that's why they're called the Mario brothers)