Celeste comes from the Latin caelestis, meaning "heavenly" or "of the sky." The same root gives the English "celestial."
Celeste has been rising rapidly in the U.S., currently sitting in the top 250.
Celeste 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 Celeste reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.