The Clown Prince of Crime
Super Freak
Does Luke call himself Skywalker at all before Uncle Owen and Aunt Beru are murdered? May be he goes by the name Luke Lars
It would make a great scene on the Death Star if Leia had kept her real surname.
I don't remember if he uses his full name, but I'm sure in school he uses his full name. Didn't he want to be a pilot because his friends were going to pilot school in the summer? I'm sure he had to use his full name in the application, unless he just goes by a single name like Madonna or Sting..or Luke Johnson or something.