One of the mysteries of the English language finally explained.
The plant good King Henry, Chenopodium bonus-henricus.
Late 16th century; earliest use found in John Gerard (c1545–1612), herbalist. From good + king + the male forename Harry, apparently as alteration of good Henry by association with one of the kings of England who bore the name Henry.
good King Harry/ˌɡʊd kɪŋ ˈhari/
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