Bingowings said:

LexX said:

Well, if there's Skywalker in OT and Skywalker in PT then you'd need to change the names, too...

Why?

Because it spoils the whole surprise anyway. I don't think anyone wouldn't think that Luke and that guy in PT aren't relative to each other once they hear "Skywalker".

Edit: and I couldn't care less if Skywalker is or isn't a popular name; if you have three movies with one Skywalker and three movies with another, it would be a bigger surprise that they aren't relative.