While the initials may be most closely associated with the 1960s Pontiac GTO muscle car, the origin actually traces back as a car name to the Ferrari 250 GTO.
1969 Pontiac GTO Ram Air IV, Sunnyside Classics
1969 Pontiac GTO 370 HP Ram Air V-8-US Ski Team-original 13.5
What did the GTO mean when use by Pontiac on their cars? - Quora
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1966 Pontiac GTO Classic Auto Mall
Tested: GTO vs. GTO—Two Icons of the Past Face Off
Ram Air in Rare Air - Mecum Auctions
Tested: GTO vs. GTO—Two Icons of the Past Face Off
What Does GTO Stand For? We Dig Into Pontiac's Muscle Car Past!
1964 Pontiac GTO - Automotive Heritage Foundation