Marigold

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late Middle English: from the given name Mary (probably referring to the Virgin) + dialect gold, denoting the corn or garden marigold in Old English.

wiktionary

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From Middle English marigolde, marygoldye, from Mary(“referring to the Virgin Mary”) + golde(“marigold”).

etymonline

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marigold (n.)

popular name of several plants with golden or bright yellow flowers, late 14c., marygolde, from Mary (probably a reference to the Virgin) + gold, for color. The Old English name for the flower was simply golde. Compare Dutch goudbloom, German Goldblume. As a color name, by 1770.