Celia is from the Latin caelum (heaven, sky) or alternately a feminine of the Roman Caelius. First Latina featured on a US quarter (2024).
Celia 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 Celia reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.