Cthylla

Cthylla (the Secret Daughter of Cthulhu) is a fictional character in the Cthulhu Mythos of H. P. Lovecraft. Cthylla was created by Brian Lumley, who mentioned her in his Titus Crow novel The Transition Of Titus Crow (1975), though he never actually described her. Tina L. Jens, however, depicted Cthylla as a giant, winged octopus in her short story "In His Daughter's Darkling Womb" (1997).

Cthylla's name may be a reference to Scylla, a sea monster of Greek myth.

Read more about Cthylla:  Cthylla in The Mythos