Scylla
No, there was no Greek or Roman god or demigod named Alexis. The name Alexis is of Greek origin, and was originally a male name, meaning "defender". There is a Saint Alexis-Falconieri in Catholic mythology. He and six of his friends left the tumult of Florence for Mount Senario to live a quite life as the "Servers of Mary".
Hades, Poseidon, and Zeus were three of the six children of the Titans Rhea and Cronus, their sisters were Hera, Demeter, and Hestia; each child was swallowed whole at birth by Cronus, save for Zeus the youngest who Rhea hid away.
They are monsters from Greek mythology. Myths describing Scylla can vary but most attribute her six long necks and grisly heads, and then an over abundance of tentacles, teeth, tails, and dog heads attached to her waist. Charybdis is a huge maelstrom, or whirlpool.Scylla was a six-headed monster and Charybdis was a whirlpool. They both were in the strait of Messina, which separates Sicily form the mainland.
They are called the Gegenees.
There are twelve, six males and six females.
Six Vestal Virgins.
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Scylla
You may be referring to the Hydra, but the hydra was also said to have nine heads instead of six.
Scylla
Cronus, Oceanus, and Hyperiôn. There were three more male Titans, and six female born to Ouranos and Gaea.
In Greek mythology, the six children of Mother Earth (Gaea) are the Titans: Oceanus, Coeus, Crius, Hyperion, Iapetus, and Cronus.
Demeter was born as the daughter of Cronus and Rhea, who were Titans in Greek mythology. She was one of the six siblings known as the Olympian Gods, who later overthrew their Titan parents and ruled in their place.
Six Hands Across a Table was created on 1963-03-16.
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A six-headed creature with the legs and bark of a dog is a mythical beast known as the Cerberus. In Greek mythology, Cerberus is a multi-headed dog that guards the entrance to the underworld to prevent the dead from escaping and the living from entering.