In Pixar's Cars 3, Cruz Ramirez uses her own name when she wins the Florida 500.
Lightning McQueen initially returns to racing to defeat Jackson Storm, while Cruz works as his trainer. During the Florida 500, Lightning recognizes Cruz's talent and gives her the chance to race in his place. She takes the number 95 and competes against Storm.
Cruz wins the race, but the film does not rename her Lightning McQueen. She remains Cruz Ramirez, establishing her own identity as a racer while honoring Lightning's mentorship and legacy. Lightning then adopts a coaching role and joins her for later competition.
This distinction matters because the ending is about succession rather than replacement. Cruz becomes a new Piston Cup star, while Lightning continues racing in a redesigned Doc Hudson-inspired livery. The victory also completes Cruz's shift from trainer to professional competitor.