What is Obama's last name?

Just want to now
Update: OK guys this is a serious question you are all saying it is The Man and Lama Ding DOng and all that but I am not an idiot so please don't treat me like one. Please CAN YOU GUYS GIVE ME AN ACTUAL SERIOUS ANSWER!!!
Update 2: OK guys this is a serious question you are all saying it is The Man and Lama Ding DOng and all that but I am not an idiot so please don't treat me like one. Please CAN YOU GUYS GIVE ME AN ACTUAL SERIOUS ANSWER!!!
Update 3: OK so you guys are saying stuff like 'Obama' but please give me his SURNAME not the actual name of his. If you asked for Donald trumps surname I would say trump please do the same for me
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