Petal comes from the English word for the soft leaf of a flower — from the Greek petalon, meaning "leaf." Used as a term of endearment in English ("my little petal") and recently adopted as a given name.
Petal remains rare but is rising as part of the broader wave of one-word nature names.
Petal 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 Petal reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.