You don't know jack . . .

Does anyone know where the phrase "you don't know jack" or you don't know jack ****" originated. I know what the phrase "means" -- I just wanted to know where it came from.

And, please, please, don't send the joke about Jack Schidt and his family Dip Schidt, etc.

Thanks!

'Jack' is a catch-all English name for almost anyone - Jack of all trades, Jack Tar etc. It comes from the French 'Jaques' a traditional name for a peasant centuries ago. It spead to things other than people, as your examples illustrate.