Sidonie is the French feminine of Sidonius — meaning "from Sidon," the ancient Phoenician city (modern Saida, Lebanon).
Sidonie-Gabrielle Colette (1873-1954), the French novelist of Gigi, was the most famous bearer.
Sidonie 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 Sidonie reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.