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Surname meaning for "Sibley"
English: from the popular medieval female personal name Sibley, a vernacular form of Latin Sibilla, from Greek Sibylla, a title of obscure origin borne by various oracular priestesses in classical times. In Christian mythology the sibyls came to be classed as pagan prophets (who had prophesied the coming of Christ), and hence the name was an acceptable one that could be bestowed on a Christian child.