Antia is from the Galician-Asturian Antía — Galician-Asturian rendition of Antía / Anteia (Greek mythological figure + early Christian saint). Antia is one of the Galician + Asturian feminine names — central to traditional Iberian Atlantic Indigenous heritage. Galician-Asturian feminine name reflecting Iberian Indigenous heritage.
Antia 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 Antia reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.