Rainbow Six instantly comes to mind as it’s based on a Tom Clancy novel. Metro 2033 is a novel series too. Suppose you could count Dynasty Warriors too since it’s based on ROTK.
Anything else good?
The biggest ones that come to mind for me are The Witcher and anything Lord of the Rings or Harry Potter. I know the SMT series was originally based off the Digital Devil novels, but kind of developed its own identity pretty quickly.
There were some interesting names in this list from Wikipedia I found.
I always forget that Conan was a pulp novel series before it blew up via the movie.
It’s kind of racist, but if you’re diving into 1920s pulp you should expect that.