Got him.. And Wenceslas? I got it, but had to type it about 12 times. I know there are some spelling freaks out there, but really? Sadly missed Princess Peach, the Earl of Sandwich and Lord Byron.
Not really, considering that one is fairly recent, appeals to all ages, and is enormously popular. Don Juan may be famous, but never confuse fame with popularity.
What's wrong with Harry Potter? It's a solid and popular set of books that came out recently whose main antagonist is prevalent in popular culture. These 'sad that more people know x than y' comments always annoy me, usually because 'y' is an obscure novel from the eighteenth century or some other sort of thing like that.
Earl Hooker should work for the Blues Guitarist clue. Maybe not quite as famous as BB King, but he's the first one I thought of (although possibly my Chicago is showing?)