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Jack /jack/ [1 syll.] as a boys' name is pronounced jak. It is of Old English and Hebrew origin, and the meaning of Jack is God is gracious; he who supplants. Name based on John (Hebrew), or Jacques, the French form of Jacob (Hebrew). The name has a rugged, down-to-earth aura.
From Wikipedia, the free encyclopedia. Black Jack is the nickname of the following people: 1  John Vernou Bouvier III (1891â1957), father of Jacqueline Kennedy Onassis.  Jack Blackham (1854â1932), Australian cricketer.