A friend of mine sued a film maker for using his name maliciously in a feature film. My friend's exact name was used for the name of the rogue brokerage firm in the film. My friend and the studio settled for a few tens of thousands of dollars. (I had told him not to sue, it would only draw attention to him.)
I was wrong. The film was not supported by the studio and consequently was a bomb.
I just saw the film on cable re-run and it was really good. Had it gotten a modicum of promotion it might have done well at the box office.