No
State of Jefferson?
I don't think Upstate New York would be called Ontario, since it might create confusion with the neighboring Canadian province. Adirondack might be a better name.
And Allegheny might be a better for Western PA... but as for Eastern PA it's harder since it includes a bunch of regions... the Delaware Valley, Pennsylvania Piedmont, Dutch County, Lehigh Valley, Wyoming Valley, Endless Mountains, Pocono Mountains and Coal Country. Maybe Susquehanna would be a nice name, though the Susquehanna River area flows into West PA and doesn't cover all of East PA... Just an idea.
As for California, another name could be Sacramento or San Joaquin; the names of the two big areas in the Central Valley. West Coast is a cool name, as would be Pacific.
Southern California, could be just plain Southern California, SoCal.