Bayou

google

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mid 18th century: from Louisiana French, from Choctaw bayuk .

wiktionary

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From Cajun French bayou, from Choctaw bayuk(“creek”). Doublet of bogue.

etymonline

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bayou (n.)

"sluggish watercourse, outlet of a lake or river," 1766, American English, via Louisiana French, from Choctaw (Muskogean) bayuk "small stream."