What is Hermione Granger's middle name?

The story behind the answer

The correct answer is Jean. In the official canon, Hermione’s full name is Hermione Jean Granger. J.K. Rowling revealed that she originally considered “Jane” for Hermione’s middle name but changed it to “Jean,” later giving “Jane” to Dolores Jane Umbridge—fittingly reserving the plainer, old-fashioned middle name for a character meant to feel prim and officious.

A handy way to remember it: two members of the Golden Trio have J middle names—Harry James and Hermione Jean—while Ron’s is the outlier (Bilius). Pairing Hermione with Harry’s “J” helps lock in “Jean,” not “Jane,” “Jo,” or “Emma” (which is the actress Emma Watson’s name, not Hermione’s).