Asteria (Ἀστερία) is the Greek word for "starry" or "of the stars." A Greek Titaness, daughter of Coeus and Phoebe — sister of Leto and mother of Hekate by Perses.
Used widely in modern Greece.
Asteria 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.
In Pythagorean numerology the letters of Asteria reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.