OIOLYKA (or Oeolyca) was a Haliad (Marine) Nymph daughter of the hundred-handed giant Briareos, and probably a goddess of storm-generated wave-surges.

Her name means "Lone Wolf," which is perhaps a reference to the jaws of a large breaking wave generated by her parents--the storm-god Briareus and wave-goddess Kymopoleia.

Stesichorus, Fragment 299 (from Scholiast on Apollonius Rhodius) (trans. Campbell, Vol. Greek Lyric III) (C7th to 6th B.C.) :
"There are many stories about the girdle [that Herakles was sent to fetch] : some say it belonged to Hippolyta, others to Deilyka. Ibycus is alone in saying that it belonged to Oiolyka, daughter of Briareos."

Sources:

• Greek Lyric III Ibycus, Fragments - Greek Lyric C6th B.C.