Washington Mutual banks will probably continue to operate under the WaMu name. The way GM owns GMC, GMAC, etc... Here's a quote from another article about new WaMu branches opening:
"Work on the new WaMu branch at 910 Cypress Ave., former home to Blockbuster Video, started in late August. The new location is expected to open in early November, WaMu spokesman Gary Kischner said.
On Sept. 25, government regulators seized the assets of the Seattle-based bank and sold them to JPMorgan Chase for $1.9 billion. The takeover averted a huge taxpayer bailout that would have raided the Federal Deposit Insurance Corp.
"Business continues as always, and now we are backed by the strength of Chase," Kischner said."