fjǫlhǫfðaðr (Old Norse) comes from Old Norse hǫfuð, from Old Norse -i, from Latin -ē, from Latin dis-, from Latin calceus, from Latin calx, from Ancient Greek χάλιξ — small stone, pebble; gravel, rubble.
fjǫlhǫfðaðr (Old Norse): many-headed, polycephalic