on Jane Friedman site:
Your book title, along with the cover, is a key marketing tool: it must prompt potential readers to pick up the book in a bookstore or click on it online because they want to know more.
General nonfiction often makes its purpose explicit in the title or subtitle, but memoirs and novels are more ethereal; they explore themes, characters and situations, and their titles can go in a thousand directions. This richness of choice can sometimes stump a writer.
Here’s how other authors chose their memoir or novel title, with valuable insight on finding the perfect title for your book.