Karol is the Spanish variant of Carol — and in Polish, the feminine form of the masculine Karol (Charles). Forbes 30 Under 30 (2020).
Karol 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 Karol reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.