Ladybird

wiktionary

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From lady +‎ bird, the “lady” here referring to the Virgin Mary, Jesus’ mother. Compare German Marienkäfer(literally “Mary beetle/bug”).

etymonline

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ladybird (n.)

also lady-bird, 1590s, "sweetheart," a term of endearment, from lady + bird (n.2). As the name of a type of beetle, 1670s, the earlier form of ladybug.