Joaquin.
Explanation: The joke relies on a pun involving the name “Joaquin,” which sounds like “walking” when spoken aloud. When the Mexican guy’s car breaks down, he can no longer drive and is forced to walk instead. The humor arises from this play on words, connecting the situation (walking) with the name “Joaquin,” making it an amusing twist on the misfortune of the car breaking down. This joke highlights how phonetic similarities can be used for comedic effect.