Jeep was the Trademark of Willy's Overland, Williy's Overland was the trademark of Willy's which is USA, however some Willy's were made in Australia in the 1930's , likewise some Jeeps were made in Brisbane, Queensland in 1958.
Also see Jeeps in Australia
NOTE: Some Jeeps were made by Ford; Holden made some bodies for Willy's cars.