harry potter - How many books did Gilderoy Lockhart write?

We know Gilderoy Lockhart wrote the multi-volume "Magical Me." But there are other books as well that he wrote, including one about pests.

What is the total number of books that Gilderoy Lockhart wrote, counting each book of Magical Me as a unique title?

Answer

There appear to be nine books; however, both Fred Weasley and Lockhart himself describe the seven books on the Hogwarts list as the complete set

In the beginning of Chamber of Secrets Harry's booklist contains the following titles by Gilderoy Lockheart:

1. Break with a Banshee


2. Gadding with Ghouls



3. Holidays with Hags


4. Travels with Trolls


5. Voyages with Vampires


6. Wanderings with Werewolves


7. Year with the Yeti

Fred promptly says (my emphasis):

"You've been told to get all Lockhart's books, too!"

This would imply that the complete set of Lockhart's books is seven in number.

When they are degnoming the garden Mrs. Weasley reads from Gilderoy Lockhart's Guide to Household Pests so that brings us up to eight books altogether.

When they meet Lockhart in Flourish and Blotts he is signing copies of Magical Me, which would bring us up to nine books.

Lockhart gives Harry a complete set of his books:

The crowd cheered and clapped and Harry found himself being presented with the entire works of Gilderoy Lockhart.

Harry promptly gives these books to Ginny:

"You have these." Harry mumbled to her, tipping the books into the cauldron. "I'll buy my own –"

This implies that there wouldn't be too many other books besides for the seven that were required for school, because otherwise there would be no need to give them to Ginny, nor to buy others for himself.

Lockhart himself, in the first Defense Against the Dark arts class appears to describe the books on the Hogwarts list as the complete set:

"I see you've all bought a complete set of my books – well done."