Inherited from Middle English Oliver, from Old French Olivier, by folk etymology derived from the Latin name Olīvārius, but probably representing an Old High German form of Old Norse Óleifr (“ancestral + relic”) (modern Danish Olaf and Swedish Olof), or Proto-Germanic *ala- (“all”) + *wēraz (“true”) (modern Swedish allvar). Name of a paladin of Charlemagne in medieval French romance.