Which Harry Potter book was the first published under J.K. Rowling’s full professional name with the initial K?

Harry Potter and the Philosopher’s Stone was the first book published under J.K. Rowling’s professional name with the initial K.

Rowling was born Joanne Rowling, without a middle name. Bloomsbury asked her to use two initials for the Harry Potter books, partly because the publisher believed a gender-neutral presentation might appeal to boys. Rowling chose K in honor of her paternal grandmother, Kathleen, creating the name J.K. Rowling.

The first book appeared in the United Kingdom in 1997 and credited J.K. Rowling on its cover. The author’s later adult novel The Casual Vacancy was also published under J.K. Rowling, while her crime novels used the pseudonym Robert Galbraith.

The American edition changed the title to Harry Potter and the Sorcerer’s Stone, but it retained the J.K. Rowling credit. This makes the first novel distinct from the later books in the series and from the author’s other publishing identities.