Etymology
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Oliver

masc. personal name, in medieval lore the name of one of Charlemagne's peers, friend of Roland, from French Olivier, from Middle Low German Alfihar, literally "elf-host, elf-army," from alf "elf" (see elf) + hari "host, army" (see harry (v.)). It is cognate with the Anglo-Saxon name Ælfhere. The form in Old French was influenced by olivier "olive tree."

updated on August 20, 2019

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Definitions of Oliver from WordNet

Oliver (n.)
United States jazz musician who influenced the style of Louis Armstrong (1885-1938);
Synonyms: Joseph Oliver / King Oliver
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.