A book's title is sometimes different depending on the country. As for Harry Potter, the first book HP and the Sorceror's Stone, was actually HP and the Philosopher's Stone in England. The publisher was afraid that U.S. kids would find a philosopher boring and uncool which would translate into lower book sales.
JK Rowling's first choice was 'philosopher's stone' and she wishes she had kept it for the U.S. title but hey, at that point she was just happy to get her first book published!
So which title do you prefer?