Theia (Θεία) is the Greek titaness of light and the mother of Helios (the sun), Selene (the moon), and Eos (the dawn). The name simply means "goddess" or "divine."
Theia is rare as a given name but rising as part of the broader return of Greek mythological names.
Theia does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Theia reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.