From Frankish *fulc, *folc, *fluc, from Proto-Germanic *flukkaz (“flock, group, multitude”). More at flock.
fulc m (oblique plural fuls, nominative singular fuls, nominative plural fulc)
- flock (guided herd of animals)
- Paiens sunt morz a millers e a fuls (The Song of Roland, circa 1150, line 1439)
- The peasants died, by the thousands and in flocks.