That's the Internet Movie Database...

There was no real movie called "The Man with No Name"...but there is a documentary by that name about Clint Eastwood and Spaghetti Westerns.

The first of the trilogy starring the Man with No Name, Fistful of Dollars, his name was listed to be "Joe" in the credits. In the second, For a Few Dollars More, he was listed to be "Monco". In the Good, the Bad, and the Ugly, he was simply "Blondie".