What are the origins of the word 'happy'?
From Online Etymological Dictionary:
c.1205, "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 c.1225.
c. = circa or "around"
O.N. = Old Norse
P.Gmc. = Proto Germanic
O.E. = Old English