From Middle English Lucy, from Old French Lucie, from Lucia, name of a Sicilian martyr, from the Latin feminine form of the Roman praenomenLucius, from lux. The name of the Australopithecus skeleton came from the Beatles song "Lucy in the Sky with Diamonds", which the discoverers were listening to at the time. The song also gave its name to the slang term for LSD, as many believe it is essentially a reference to the drug.
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