What are the main conditions that novelsists adher to for choosing a novel's title?

Question

I noticed that many novels had different titles of their contents. When a novelist writes down a novel and chooses a title, does he/she take into consideration the restrict relation between the novel's contents and its title?

Answer 1

Getting on well with the editor who is about to publish the novel and thinks the title is not good or is too much like one that company or another published recently.
Sometimes the title is an obscure inside reference, One Good Knight is a book where the title takes a totally different meaning in the last pages. Both meaning are good in this case, but the alternate is more fun.
Some books have various titles during their writing and different titles in England than in US.

Answer 2

Whatever the marketing department of the publishing house says.

Answer 3

surprisingly enough, many times it is the PUBLISHER, and not the author that chooses the title for the finished product.