One is a fictional character and the other is a real person. Both are well known names but it is very hard to determine who is the most famous.
Luke Skywalker is more of a classic. Lady Gaga is more modern. But Luke Skywalker is more famous than Lady Gaga to old people. I guess Luke Skywalker is more famous.
luke skywalker
Luke Skywalker
luke skywalker
Luke Skywalker
Luke Skywalker
Luke Skywalker.
Lionel Messi is famous than Luke Skywalker
Definitely Luke Skywalker
Luke Skywalker
Luke Skywalker
Luke Skywalker
Luke Skywalker