You might think there isn't much to say about the title, since it's pretty clear where it comes from (we're looking at you, Artemis Fowl II). Though later books in the series are named after the main character and whatever shenanigans he's up to at the time, this one is all about introducing us to the force that is Artemis Fowl II. The End.
Then again, what happens if we think about the title in terms of the young adult fiction genre as a whole? Giving the book a title that points to an important figure in its pages is a characteristic that can be found in most genres, but it's a particularly popular practice in YA fiction. And Artemis Fowl fits in quite nicely with its cohorts Harry Potter, Percy Jackson, and Eragon.