Sophie is the French and German form of Sophia — from the Greek sophía (σοφία), meaning "wisdom." Where Sophia is the formal full name (and currently the most popular U.S. baby girl name), Sophie is the everyday diminutive — though increasingly used independently.
Sophie has been continuously in the U.S. top 200 since the 1990s. In the United Kingdom, France, and Germany it is often in the top 20. Today in the U.S.
Sophie 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 Sophie reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.