The original DCA park name in California was a political compromise (with the state and township) at the time.
Early in the time of planning, they had at one time been calling the new Anaheim park "Westcot."
With the recent (about 3 years ago) rebuilding of the DCA park, they changed the name from "Disney's California Adventure" over to the new (and current) name, "Disney California Adventure."
(No, I'm not kidding.)