I am reading Harry Potter and the Half - Blood Prince which is the 6th part in the series and I have read the 1st  Harry Potter and the Phisolopher Stone, 2nd Harry potter and the Chamber of Secrets, 3rd Harry Potter and the Prisoner of Askaban, 4th Harry Potter and the Goblet of Fire, 5th Harry Potter and the Order of Phoneix and 7th is Harry Potter and the Deathly Hallows.

As I am reding the book I feel instead of these titles there could be more like:
1.  The chosen one 
2.  The Boy who lived.
These titles apply for any part.
for the ending Lord Voldemort ends instead of him Harry Potter could have died proving this nobody could defeated Lord Voldemort.
and another harry confesses his love for the girl named Ginny instead of her he could have loved hermoine the best friend of hers after his friend Ron. They 3 were the only friends.

Hope it helps!