Kallisto means most beautiful; the nymph of that name was set among the stars as the Great Bear.
Radiant and celestial, it links earthly beauty to the night sky.
Kallisto 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.
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In Pythagorean numerology the letters of Kallisto reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.