The BFG is a pretty obvious title for this book. The only other obvious option might’ve been to name the book after the main character, Sophie, or at least give them dual credit with a “Sophie and The BFG” kinda thing.
But rest assured Dahl has a reason for this. Sophie leads a perfectly normal (if a little sad) life before she meets the BFG. The BFG changes everything, not only about her situation, but about how she sees the world.
Plus, he’s pretty amazing in general, what with his dream-catching and his ability to hear things we can’t. He deserves the title. And he seems even more deserving of it when we find out at the end that he is the “real” author.