1866, from Modern Latin, from Greek eklampsis "a shining forth, exceeding brightness," from ek- "out" (see ex-) + stem of lampein "to shine" (see lamp) + abstract noun ending -ia.
reduced from Old English Hamtunscir; named for the city of Southampton, which originally was simply Hamtun. Norman scribes mangled the county name to Hauntunescire, later Hantescire, hence the abbrev. Hants.