Origin: 1150–1200; Middle English < Old Norse happ luck, chance; akin to Old English gehæp fit, convenient; probably akin to OCS kobŭ auspice, Old Irish cob victory
c.1200, "chance, luck," from O.N. happ "chance, good luck," from P.Gmc. *khapan (source of O.E. gehæp "convenient, fit"). Meaning "good fortune" is from early 13c.