Callisto

Callisto is one of Jupiter's moons that was discovered by Galileo. It is Jupiter's second largest moon, and is nearly as large as the planet Mercury. It is composed of equal amounts of rock and ices.

In X-Men, Callisto was a mutant who possessed superhuman senses of sight, hearing, smell, taste, and touch. She was once a beautiful woman, but became scarred as a result of violent encounters with normal humans. She was the leader of the Morlocks, a group of mutants that lived in the sewers. She lost leadership of the Morlocks when Storm defeated her in a duel.  She later became a servant of the wizard Kulan Gath. When she found herself in a new timeline, she became an ally of the X-Men and even rescued Professor X. 

Callisto was a character in Xena: Warrior Princess and in Hercules: The Legendary Journeys. Callisto witnessed the death of her mother and sister at the hands of Xena, who killed them during a chaotic attack on her village. As a result of this trauma, Callisto became a ruthless and bloody warlord, who was out to get Xena. She died twice, became an immortal, then a God, then a demon, and ultimately an archdemon. 

The Callisto series was a series of science fiction novels published in the 1970s by author Lin Carter.

In Doctor Who, the Callisto Pulse was a device that could disarm micro-explosives. River Song traded a Callisto Pulse for a vortex manipulator she needed to reach the Doctor.

In Star Trek, the U.S.S. Callisto was a Federation starship, and in a Star Wars novel, Callisto was the name of an Imperial Star Destroyer.

In Greek mythology, Callisto was a nymph of Artemis. She was transformed into a bear and set among the stars. Callisto has never ranked in the top 1,000 names in the United States. In 2012, 7 girls were named Callisto in the U.S.