This post is by Jason Boone from No Film School
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A major motion picture will often go through production under a working title, providing the project with a name while it’s still in development. This gives the film team a chance to come up with a proper title while also keeping a veil of secrecy over the project.
This is especially apparent for more popular films, such as Return of the Jedi, which had a working title of Blue Harvest, as the franchise was already extremely popular when the film into production. The Avengers is another perfect example, where Marvel and Joss Whedon selected the perfect title, Group Hug, for the megahit.