Beak
Middle English: from Old French bec, from Latin beccus, of Celtic origin.
wiktionary
From Middle English bec, borrowed from Anglo-Norman bec, from Latin beccus, from Gaulish *bekkos, from Proto-Celtic *bekkos(“beak, snout”), possibly from Proto-Indo-European *bak-, *baḱ-(“pointed stick, peg”). Cognate with Breton beg(“beak”). Compare Saterland Frisian Bäk(“mouth; muzzle; beak”); Dutch bek(“beak; bill; neb”).
Unknown; originally cant; first recorded in 17thC; probably related to obsolete cant beck "constable". [1] [2] [3]
etymonline
beak (n.)
mid-13c., "bird's bill," from Old French bec "beak," figuratively "mouth," also "tip or point of a nose, a lance, a ship, a shoe," from Late Latin beccus (source also of Italian becco, Spanish pico), by the Romans said to be of Gaulish origin, perhaps from Gaulish beccus, possibly related to Celtic stem *bacc- "hook." Or there may be a link in Old English becca "pickax, sharp end." Modern jocular sense of "human nose" is from 1854 (the word was used mid-15c. in the same sense).
