Why some movies or music band, have "The" before their names? I know that "the" articles we use when we talk abaut specific or unique thing but some movie tittle make me realy confused. For example:

With "The"
The Girl with the Dragon Tattoo
The Hunger
The King's Speech

Without "The"
Robin Hood (I guess that is specific name so why this movie hasn't "the" prefix?)
Conviction
Perfect Sense

If someone can write next to the movie tittle why/why not we use "the" prefix i would be greatful.