Latinate name, first used by Shakespeare for the rich heiress wooed by the duke in Twelfth Night (1599). Shakespeare may have taken it as a feminine form of Oliver or he may have derived it from Latin oliva ‘olive’. In the 1970s it was particularly associated with the Australian pop singer and actress Olivia Newton-John (b. 1948). Since the 1990s it has been very popular throughout the English-speaking world.
German and Dutch: habitational name from any of the various places called Zelle or Celle, in particular Celle near Hannover, named with German Zelle ‘cell’, Middle High German zelle (from Latin cella ‘small room’), or a topographic name from this word, denoting someone who lived near the site of a hermit's cell.