Marigold is named for the bright orange-yellow flower — a contraction of "Mary's Gold," referring to the Virgin Mary (the flower was used in medieval Catholic devotion to Mary). The botanical genus is Tagetes for one type and Calendula for another; both are commonly called marigolds.
Marigold has been rising rapidly as a girls' name in the 2020s. Today Marigold sits in the U.S. top 700.
Marigold 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 Marigold reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.