Vappu comes from Walpurga and names the Finnish May Day, the great spring festival. It carries celebration, warmth and renewal.
Vappu 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 Vappu reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.