Here is a list of 6 authors who earned more by screen adaptation than books.
We are all aware of J. K. Rowling either due to the Harry Potter series or due to her transphobic comments.
People who are into horror movies, which are a huge population, certainly know Stephen King and even people who hate the horror genre.
People who love to read romance already knew about Nicholas Sparks but it was mostly The Notebook when people started talking about Sparks and the kind of romance that he offers.
American novelist Stephanie Meyer is certainly popular because of the Twilight series. As we grew up we realized Twilight was a lot like a teen Wattpad fan fiction.
Even if you have not watched it, I bet you have heard the name of Hannibal Lecter. Hannibal is a famous character created by Harris.
Grisham was not only a novelist; he was also a lawyer, which explains why he is so popular because of his legal thrillers.