OK, from memory a quick list of the others:
Jimi Hendrix
Prince
B.B. King
Bo Diddley
Muddy Waters
Buddy Guy
Freddie King
Albert King
Robert Cray
Lenny Kravitz
A bunch of these are the most famous players of the Blues, which, had dozens of other famous black guitaristrs, but they were not world-famous on the order of Hendrix or Chuck Berry who were real super-stars. Someone like John Lee Hooker, famous to some, but probably unknown to most. Might cover some of those on my list above too.
Yes, many in the strictly blues category, but none frankly of the superstardom of Chuck Berry - or Prince (whom I’m not sure is pure black; even his music is B&W).
Jimi Hendrix - another of the hippie generation that never really had a hit, but is well known mostly because of the hippie culture San-Fran sound thing. Overrated, as far as being a true star who actually churned out hits.