there's a thread around here that says what's cannon:
movies, the radio drama's & the novels of the movies
besides that only what GL says is canon... if McCallum says it: it's not. If someone says "GL told me this", it's not canon. Only what he directly says is canon.
Originally posted by Anakin_the_Hutt
I'm asking if the audience is supposed to believe that Luke just never came across the name Skywalker while he lived there.
The audience can believe what they wany.
Again, skywalker might be a very common name and thus Luke never laid the link. Besides: No one knew Anakin & Padme were married, Padme died with child (or so they think). What's left? The only thing that had to happen was Owen & Beru explaining that they suddenly got a baby. Besides that there is no link between Anakin & Luke which would have gave suspiciion to either Luke or Vader.
besides, the audience is also supposed to believe in the Force, lightsabres, hyperspace etc. I'll worry more about them accepting such things than a Jedi being too lazy to ask the adoptive aunt & uncle to change the kid's last name