Your question cannot be answered with the information currently available.
"More Famous" is too idiomatic to provide an adequate answer without poll data from various areas & age groups, perhaps even from different socio economic groups.
Without any data of this sort there is no way to really determine which person is more widely known to the general populace therefore any answer would really be speculation, opinion and/or conjecture from the individual who answered.
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Darth Vader
Darth Vader. Although Blackbeard has been around much longer than Darth Vader he is not as famous. More parodies, movies, fiction, and fanbase surround Darth Vader than Blackbeard. One thing to keep in mind is that Darth Vader is fictional while Blackbeard is real.
I have never heard of Dwanye Johnson, or even Dwayne Johnson. Darth Vader I have heard of. Does that answer your question?
I believe George Washington is more famous because he developed our nation, Darth Vader betrayed his own son.
Darth Vader is known internationally .