HSBC Holdings has named Simon Cooper as the new head of its commercial banking arm.Mr Cooper, 45, has been CEO of HSBC Middle East and North Africa for the past four years and will replace Alan Keir, who will become chief executive of HSBC Bank Plc, a role that oversees operations in Britain, continental Europe, Turkey, the Middle East, Africa and Bermuda.He will take over the position in October in one of a batch of senior management changes unveiled yesterday.Keir will replace Brian Robertson, who is retiring after 38 years at the bank.