/jay"keuhb/ for 1, 3; Fr. /zhann kawb"/ for 2 , n.
1. the second son of Isaac, the twin brother of Esau, and father of the 12 patriarchs. Gen. 25:24-34.
2. François /frddahonn swann"/ , born 1920, French geneticist: Nobel prize for medicine 1965.
3. a male given name: from a Hebrew word meaning "supplanter."