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There are 3 contexts: the name of a cheese similar to cheddar (but made with a washed curd), the name of a device that you use to lift your car, the surname of someone associated with it. In the second case, you can imagine pressing the cheese using the "jack".

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“Jack” is also used to refer to the female end of a wire connector, e.g. audio jack.

If you include slang usages there's also jack off (jerk off), car got jacked (hijacked), he got jacked (muscular), doesn't know jack (jack shit), jack in (term from megaman battle network)

I'm under the impression 'Jacking in' was introduced by William Gibson in Neuromancer, 1984

also a wooden assistant for removing one’s boots (aka boot jack)

also a playing card, or a small metallic object with tetrahedrally oriented spikes used in the game Jacks https://en.wiktionary.org/wiki/jack#English

Jacks and jennies, male and female asses, jack leg, a bad tradesman, jacks a pointless kids game, jimmy jack, fiddle fart, ball the jack, go flat out

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