Has a Hurricane ever affected Southern California?

Answer 1

http://www.nhc.noaa.gov/paststate.shtml
According to this chart, there has not been a hurricane strike on Southern California, though they have probably received heavy rains from the remains of hurricanes. The cold California Current that flows along the coast tends to weaken hurricanes, so that's probably the reason. Hurricanes needs a good supply of warm water to maintain themselves.
And yes, they are still refered to as hurricanes in the Eastern Pacific. In the Western Pacific they are called typhoons and in the Indian Ocean they are refered to as cyclones, although any counterclockwise (clockwise in the Southern Hemisphere) rotation is refered to as a cyclone.

Answer 2

No. Hurricanes are Atlantic storms. Pacific storms are called cyclones

Answer 3

Not since I've been here, (and I was born here in O.C. in 1950).