What is the origin of the name 'Jeep' for the iconic WWII military vehicle that revolutionized military logistics and later became a civilian brand?

During World War II, military logistics transformed modern warfare. One particular vehicle became so iconic that its name is now part of everyday language. This poll tests your knowledge about the retail logistics and branding history behind one of the most famous military vehicles of all time - the humble Jeep. Do you know the surprising origin of its name?

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From 'GP' (General Purpose) vehicle, which soldiers pronounced as 'Jeep'
Named after Eugene the Jeep, a magical character from the Popeye comic strips popular among soldiers
An acronym for 'Just Enough Essential Parts,' reflecting its minimalist design philosophy
From the Japanese term 'jipu' meaning 'to conquer terrain,' adopted after captured vehicles were studied