What is the first name of the author with the last name Silverado?

Are your facts correct? Silverado is a place in California and the title of a novel. Are you sure you are remembering that is the last name of the author? it might be a pen name for an author but a Google search didn’t show it up.

And a movie, with Scott Glenn.

And it was a failed bank in Colorado in the 1980s connected with the Bush family.

But I have never seen it as an author’s name.

Are you thinking of Adam Silvera maybe???

Shel Silverstein , perhaps?

(It’s very helpful when the OP comes back and responds on their own Qs.)

Shel Silverstein was a poet – mostly for kids, but wrote a couple of bawdy collections for adults as well. I read his kids books to my kids (and grandkids) when they were younger.

Silverstein was not a literature (i.e. fiction) author.