Will trademarking a title also cover sequels? Ex: If I trademark "Burying Davey," is "Burying Davey 2" also protected?

I can't speak to EU law. In the United States, titles are not easy to trademark. In order to be eligible for trademark, the title must develop secondary meaning. Few works achieve secondary meaning such that they become eligible for trademark. As an example, "Little Mermaid" is only registered for theme park services and greeting cards, not for books/movies/entertainment services. No one registers the title of a sequel where the sequel title is the parent title with a '2' at the end. "Toy Story" has 15 registrations right now, but Disney never filed for "Toy Story 2" or "Toy Story 3".