^Well, I don't know the order of the Sherlock Holmes stories by heart, but how boring would it be if they were called "Sherlock Holmes 2," "Sherlock Holmes 3," etc. instead of "A Scandal in Bohemia," "The Adventure of the Red-Headed League," etc.? A good title is an important part of the creative process, and of the promotional process. It's the introduction to your story, and it's worth putting some care into the first impression. Numbered-sequel titles are just lazy and soulless.