Why is Banc of California spelled with AC?

Bank of Brodhead 7 Bank of Holland 6 Bank of Romney 7 Belmont Bank & Trust 2 Blue Ridge Bank, National Association 7 BONVENU Bank National Association 4 Carson Bank 5 Columbus State Bank 6 DAKOTA Community B&TC National Association 3 First Bank Manhattan 3 First National Bank of Steeleville 4 Jones Bank 10 Lovelady State Bank 8 Luminate Bank 14 Midwest National Bank 2 Mountain Valley Bank, National Association 2 PREFERRED Bank 9 PRIMEBANK 13 RELYANCE Bank 11 Waggoner National Bank 3