Tansy is a cheerful golden button-flower; its name traces to the Greek athanasia, immortality.
Vintage and sunny, it is a charming, old-fashioned flower name.
Tansy 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 Tansy reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.