Theia comes from the Greek theios and means "divine" or "goddess". In Greek mythology Theia is the Titaness of sight and shining light, mother of the sun god Helios, the moon goddess Selene and the dawn Eos, and astronomers gave her name to the ancient planet thought to have collided with the early Earth to form the moon. In the United States Theia peaked at number 1813 in 2019 and ranks number 1989 in 2025.