Cymopoleia
goddess of the violent sea currents and waves during storms
KYMOPOLEIA (or Cymopoleia) was a Haliad nymph daughter of the god Poseidon and wife of the hundred-handed, storm-giant Briareos.
She was probably a goddess of the violent storm waves generated by her stormy husband and, like her husband, presumably was of gigantic form.
"But [the three Hekatonkheires] the glorious allies of loud-crashing Zeus have their dwelling upon Okeanos' foundations, even Kottos (Cottus) and Gyes; but Briareos, being goodly, the deep-roaring Earth-Shaker [Poseidon] made his son-in-law, giving him Kymopoleia (Cymopoleia) his daughter to wed."
Hesiod, Theogony 817 ff (trans. Evelyn-White) (Greek epic C8th or 7th B.C.)
"[The Nereis] Kymodoke (Cymodoce) who, with Kymatolege (Cymatolege) and Amphitrite, light of foot, on the misty face of the open water easily stills the waves and hushes the winds in their blowing."
Hesiod, Theogony 140 ff