Unadapted borrowing from English bacon, from Middle English bacon (“meat from the back and sides of a pig”), from Old French bacon, bacun (“ham, strip of lard”), from Frankish *bakkō, from Proto-Germanic *bakō, *baką, *bakaz (“back”), from Proto-Indo-European *bʰeg- (“back, buttocks; to vault, arch”).
Attested since 1899.