late 14c., braggen "to make a loud sound," also "to talk boastfully," of obscure origin, perhaps related to bray of a trumpet and imitative, or related to the Middle English adjective brag "ostentatious, proud; spirited, brave" (early 14c.), which probably is from Celtic, and is the source of the surname Bragg (attested from mid-13c.). Perhaps a merger of the two. Other sources suggest Old Norse bragr "the best, the toast (of anything)," also "poetry." Also see braggart for another possibility, but French brague seems too late to be the source. Related: Bragged; bragging.