Yours, Etc.: Origins and Uses of 8 Sign-Offs
late 15c., from Middle French hallebarde (earlier alabarde, 15c.), from Middle High German halmbarte "broad-axe with handle," from halm "handle" (see helm) + barte "hatchet," possibly from Proto-Germanic *bardoz "beard," also "hatchet, broadax." Alternative etymology [Kluge, Darmesteter] traces first element to helm "helmet," making the weapon an axe for smashing helmets.