While 'officials' have named the span for Willie Brown, efforts continue to recognize Emperor Norton's bridge as his own.
This in from SF Weekly:
Late Monday night, a group of unidentified artists installed a large sign at the Bay Bridge onramp at Fifth Street, commemorating Joshua A. Norton, not Willie L. Brown. Norton was a famed 19th Century San Francisco eccentric, known for his many, many proclamations, notably the one where he declared himself Emperor of the United States, and later tacked on "Protector of Mexico" to his title. In addition, Norton is best-known for his many decrees about bridges and tunnels that he had hoped to build, connecting San Francisco and Oakland.