American Bantam version: BRC (Bantam Reconnaissance Vehicle)

Willys-Overland version: MA (Military and Model "A"), later improved version was MB

Ford Motor Company version: GPW

NOTE: nobody called it the GP. All the others mentioned are internal designations anyway.

It was formally the Truck, 1/4 ton, 4x4 according to the military.

The name Jeep was given to it by soldiers and came from the Popeye comic character.