why did they come up with a title of a movie called "Unknown"

They think that unknown is a good title of a movie i don't understand why they don't come up with better titles than that like when they came up with a title like indiana jones the kingdom of the cristal skull when they mix indiana jones with alians and also they come with a title of that one movie called I am number Four i still have no intention on seeing that movie at all i will not i even have no intention on seeing that movie "Unknown" also i will not there is also a movie called rango it's here at the town theater in ephraim if people say that it's not very good then i won't see that movie at all.