Leonie is the French/German feminine of Leon — from the Latin leo (lion). Léonie Saint-Cyr — French theatrical figure. Léonie Fuller Geisendorfer — modern figure. Léonie de Spens — French historical figure. Lori Singer's character Léonie — Footloose (1984) reference. The name is widely used across German, French, and Dutch speakers; in Germany it remains in the top-50 most-popular girls' names of the 2020s. Leonie Schweers — German actress.
Leonie 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 Leonie reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.