I never title a book until it is totally finished. Then I empty my mind of all the titles I have accumulated and pick one that best serves the story. Films based on books traditionally attract a new readership with tie-in titles. It has now been or about to be republished in most countries of the world. I look upon the movie as a powerful billboard for my work.
Nobody is better at promotion than the movie people.
My major fear was that the film makers might change the title. That is the kiss of death for most novelists who sell their books to the movies. Naturally, I would like the movie to be a massive hit like The War of the Roses. At this point, I am doubtful. There are too many flaws in the movie.