Astraea (Ἀστραία) is from the Greek astron (star). The Greek goddess of innocence and justice — the last of the immortals to live among humans during the Golden Age. As humanity's wickedness increased through the Silver, Bronze, and Iron ages, all the other gods abandoned the earth — Astraea was the last to leave, ascending to the heavens to become the constellation Virgo, holding the scales of justice (the adjacent constellation Libra). In Renaissance England, Queen Elizabeth I was hailed as Astraea returned — Edmund Spenser invoked her in The Faerie Queene.
Featured in Hesiod's Works and Days and Ovid's Metamorphoses.
Astraea 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 Astraea reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.