No; however in Greek mythology Theia is the Titan goddess of heavenly light, her daughter is Selene the Titan goddess of the Moon.
Yes, that is how Earth's formed, it hit a large protoplanet called Theia.
It is believed to have formed around 4.5 billion years ago, following a collision between Earth and another planet (tentatively called Theia). This is thought to have thrown around half of Theia's mass into orbit around the Earth, which then coalesced into the Moon.
Planet size of Mars called Theia crashed into Earth - stuff spat out created moon. See related question for the full facts.
The planet Theia is a planet that was theorized to explain the formation of the Moon. The theory is that Theia was formed along with Earth at one of the Lagrangian points and then became unstable when its mass reached about 10% of Earth's mass and was attracted to and collided with Earth, thus forming the Moon. For more information, please see the Related Link below.
One thing they learned is the age of the rocks which lead to confirmation of the hypothesis that the moon was formed when a Mars sized object called Theia crashed into Earth.
The current "best" answer is the Giant Impactor hypothesis. A proto-planet called "Theia" about the size of Mars is hypothesized to have struck the proto-Earth. This splattered a bunch of stuff out into space, where it coalesced to form the Moon.
Theia is a hypothetical planet, used to explain the creation of the Moon. If it ever existed, it is unknown whether it still exists. For example, it may have merged with other pieces, to form one of the other planets.
Selene was born, the daughter of the Titan gods Hyperion and Theia.
Theia was a Titan, a child of Gaea and Uranus. The Titans ruled earth before the gods (The Olympians), but were later overthrown by their children (The Olympians). Theia was the Titan of sight and the blue sky. She also gave precious metals and jewels their shine or brightness. Because of this, she is also called the glittering goddess as well. She is mostly known for being the mother of Helios (The Sun), Eos (The Dawn), and Selene (The Moon).
Theia is the Titan goddess of heavenly light, her husband was Hyperion the Titan god of light and bore him three bright children; Helios the Sun, Eos the Dawn, and Selene the Moon.
Selene the goddess of the moon was born from two great parents and they were Theia the Titan, goddess of heavenly light and Hyperion the Titan god of light. She was born at a place called the Greek island of rhodes.
The most common term is probably "Giant Impact Hypothesis"; another term sometimes used is "Theia Impact (Hypothesis)", with "Theia" being the name of the proposed body that impacted the proto-Earth to "splash" out the Moon.