Christy is a diminutive of Christine / Christina — from the Greek christianos (follower of Christ). Christy Turlington (born 1969) — American supermodel and maternal health activist; one of the original five supermodels of the early 1990s; the face of Calvin Klein's Eternity fragrance from 1989 to 1994. After her own postpartum hemorrhage in 2003, she founded Every Mother Counts in 2010 — dedicated to ending preventable maternal deaths; the organization has invested over $30 million in maternal health programs in 13 countries. Christy Brinkley (born 1954) — American supermodel; three consecutive Sports Illustrated Swimsuit Issue covers (1979-1981). A top-300 US baby name from 1970 to 1985. Catherine Christy, Christy Mathewson is male (Hall of Fame pitcher).
Subject of countless 1990s fashion histories.
Christy 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 Christy reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.