Quick answer
Theia is a girl name meaning "goddess".
Meaning and history
Possibly derived from Greek θεά ( thea ) meaning "goddess". In Greek myth this was the name of a Titan goddess of light, glittering and glory. She was the wife of Hyperion and the mother of the sun god Helios, the moon goddess Selene, and the dawn goddess Eos.
Notes and context
Usage: greek mythology | Ancient Greek: Θεία