Bacon

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Middle English: from Old French, from a Germanic word meaning ‘ham, flitch’; related to back.

wiktionary

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From Middle English bacoun(“meat from the back and sides of a pig”), from Anglo-Norman bacon, bacun(“ham, flitch, strip of lard”), from Old Low Frankish *bakō(“ham, flitch”), from Proto-Germanic *bakô, *bakkô(“back”), from Proto-Indo-European *bʰeg-(“back, buttocks; to vault, arch”).

Cognate with Old High German bahho, bacho(“back, ham, side of bacon”) (compare Alemannic German Bache, Bachen), Old Saxon baco(“back”), Dutch bake(“side of bacon, ham”), Old English bæc(“back”). More at back.

(police): Extension of pig(“police”).

etymonline

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bacon (n.)

early 14c., "meat from the back and sides of a hog" (originally either fresh or cured, but especially cured), from Old French bacon, from Proto-Germanic *bakkon "back meat" (source also of Old High German bahho, Old Dutch baken "bacon"). Slang phrase bring home the bacon first recorded 1908; bacon formerly being the staple meat of the working class and the rural population (in Shakespeare bacon is a derisive term for "a rustic").