California tops all of you:

University of California has 6 (Berkeley, Davis, Irvine, Los Angeles, Riverside, Santa Barbara), soon to be 7 (San Diego) D-I campuses, a D-III campus (Santa Cruz), and a NAIA campus (Merced), all with their own Chancellor. 9 in all.

Diploma's read University of California, <Location>

And we have a whopping 23 campus California State University, each with their own President and Athletic Department as well.

However, I can tell you the diplomas from the four distinct names do not say California State University:

Humboldt State University
San Diego State University
San Francisco State University
San Jose State University
Sonoma State University

But all the CSU schools do say "California State University, <location>" regardless of how the school brands itself:

Fresno (Fresno State), Chico (Chico State), Fullerton, Long Beach ('confusing'), Monterey Bay, San Bernadino, Los Angeles, Channel Islands, Bakersfield, Sacramento (Sac State), Stanislaw (Stan State), East Bay, Northridge, San Marcos, Dominguez Hills

Cal Poly (San Luis Obspo) diplomas read "California Polytechnic State University"
Cal Poly Pomona diplomas read "California State Polytechnic University, Pomona"
California Maritime Academy reads "California Maritime Academy"

It's a branding nightmare. Donald Gerth (former President of Sacramento State), has claimed that the weak California State University identity has contributed to the CSU's perceived lack of prestige when compared to the University of California. This no doubt is why every school goes it's own way with branding.

The UC System share one set of trustees, and the CSU System also share one set of trustees. It was meant to be allow economy of scale, but with so many schools it results in a certain remoteness and inability to respond to challenges. Very different than in States with just a few campuses.