Other Tethyses and Heros

I want to make sure I've got this recorded somewhere:

Tethys was both sister and wife of Oceanus.

In Greek mythology, Tethys (Greek Τηθύς), daughter of Uranus and Gaia was an archaic Titaness and aquatic sea goddess, invoked in classical Greek poetry but no longer venerated in cult.  She was mother of the chief rivers of the world known to the Greeks, such as the Nile, the Alpheus, the Maeander, and about three thousand daughters called the Oceanids.
 

Considered as an embodiment of the waters of the world she also may be seen as a counterpart of Thalassa, the embodiment of the sea.

The Tethys moon of Saturn.

The Tethys Sea was a shallow Mesozoic Era sea that reached from (using present-day reference points) Mexico, across the Atlantic, to the Mediterranean Sea, and into central Asia. The vast ocean separated the huge, ancient continents of Gondwanaland and Laurasia.

Rhea was the Titaness daughter of Uranus, the sky, and Gaia, the earth, in Greek mythology. She was known as "the mother of gods."

Hero, the name of Leonato's daughter and Claudio's bride-to-be in Shakespeare's play "Much Ado About Nothing." She is the cousin of Beatrice.

Hero is lovely, gentle, and kind. She falls in love with Claudio when he falls for her, but when Don John slanders her and Claudio rashly takes revenge, she suffers terribly. But at the end of the play, Hero and Claudio are back together and the love that they have for each other increases due to the hardships they have overcome. 

Hero Brown is the sister of Yorick Brown in "Y: The Last Man" graphic novel series. She's a bad-ass warrior.

Hero and Leander, a story of Greek Mythology. 

Hero and Leander is a Greek myth, relating the story of Hērō (Greek: Ἡρώ, pron. hay-RAW (ancient) and like "hero" in English), a priestess of Aphrodite who dwelt in a tower in Sestos, at the edge of the Hellespont, and Leander (Greek: Λέανδρος, Léandros), a young man from Abydos on the other side of the strait. Leander fell in love with Hero and would swim every night across the Hellespont to be with her. Hero would light a lamp at the top of her tower to guide his way.This routine lasted through the warm summer. But one stormy winter night, the waves tossed Leander in the sea and the breezes blew out Hero's light, and Leander lost his way, and was drowned. Hero threw herself from the tower in grief and died as well.

The name Theia alone means simply, "goddess"

In Greek mythology, Theia "goddess" or "divine" (sometimes written Thea or Thia), also called Euryphaessa "wide-shining," was a Titan. Theia Euryphaessa (Θεία Εὐρυφάεσσα) brings overtones of extent and brightness. Paired in later myths with her Titan brother Hyperion as her husband, "mild-eyed Euryphaessa, the far-shining one" was said to be the mother of Helios (the Sun), Selene (the Moon), and Eos (the Dawn). Pindar praises Theia in his Fifth Isthmian ode:
"Mother of the Sun, Theia of many names, for your sake men honor gold as more powerful than anything else; and through the value you bestow on them, o queen, ships contending on the sea and yoked teams of horses in swift-whirling contests become marvels."

The Theia Hypothesis

According to the giant impact hypothesis, there was once a Mars-sized body referred to as Theia orbiting in our solar system. The planet was named after the Greek Titan who gave birth to the Moon goddess Selene—a fitting name considering that the planet Theia is thought to be responsible for the birth of our moon.