Originally a French feminine diminutive form of Jacques, the French version of James. In the 1960s it became very popular in the United States and elsewhere, influenced in part by the fame and stylish image of Jacqueline Bouvier Kennedy Onassis (1929–94), whose family was of French extraction.
Finnish: from saari ‘island’. Mostly, this is an ornamental name adopted during the name conversion movement at the end of the 19th and the beginning of the 20th centuries, but it may also be a topographic name for someone living on or near an island. It is found chiefly in central and southern Finland. In America, it is also found as an abbreviation of names containing this element, such as Viitasaari.