Hekate had a share of the sky, earth and sea... her daughter Skylla, a sea/bogy—according, at least, to the tales of our seamen... So did her daughter Skylla, a sea/bogy
Kerényi establishes Skylla as Hekate's daughter and a pre-Olympian sea-bogy whose terror was instrumentalized by seamen's narratives while her deeper divine nature exceeded any single locality.
, The Gods of the Greeks, 1951thesis