Below are websites that list the real names of famous people. NOTE: I have no affiliation to these websites so I am not endorsing any of the ads (or encouraging you to click on any of the ads) on these websites.
http://www.zelo.com/firstnames/celebs.asp "Not all celebrities were blessed with the perfect Hollywood name. In fact you may be suprised at how many famous actors you know and love were born under another name. We now have 345 Celebrity Names and growing daily!"