Circe (Κίρκη) is the Greek sorceress of the Odyssey — daughter of the sun god Helios, who turned Odysseus's men into pigs on her island Aeaea. Her name derives from kirkos, meaning "hawk."
Circe 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 Circe reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.