ladybird
LAY-dee-burd · noun
Origin
Ladybird comes from lady + bird, where lady refers to the Virgin Mary. The name likely began as a devotional nickname for the beetle, linking its small, spotted form to Mary.
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Journey
The word has stayed close to its religious roots in form, simply joining 'lady' (Mary) with 'bird' to name the beetle, without a documented shift in meaning beyond that.
Related words
Many European languages made the same devotional link: German Marienkäfer ('Mary beetle'), Danish mariehøne, Latvian mārīte, Macedonian бубамара, and Spanish mariquita all name the beetle after Mary. It's also worth comparing damselfly, another insect name built from a term for a woman.