Not known, if any.
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Luna Lovegood is her real name, there is no known middle name.
The actress who played her in the movies is Evanna Lynch.
Her name is Hermione Jean Granger.
J.K. Rowling once stated her middle name was Jane, but she changed it so that Hermione wouldn't have the same middle name as Dolores Umbridge.
The characters name is Luna Lovegood.
And the actress who plays her is Evanna Lynch.
Luna Lovegood didn't really have a nickname. She was often called Loony Lovegood behind her back, but that was by students who were making fun of her.
Hermione Jean Granger
If you mean Hermione Granger from Harry Potter the answer is Jean.
Hermione Jane Puckle instead of Hermione Jean Granger. J.K. Rowling changed the surname very early on as she felt 'Puckle' didn't suit Hermione. Hermione's middle name was not changed until after the fifth book was published and Rowling realised she has given the middle name 'Jane' to Dolores Umbridge. Not wanting Hermione to have a connection to Umbridge, Rowling changed her middle name to Jean.
Her full name is Hermione Jean Granger, or Hermione Jean Weasley when she married. J.K. Rowling originally said that her middle name was Jane but in book seven it was changed to Jean. It is presumed she did this so she did not have the same middle name as Umbridge.
I think from what I've heard in the "Chamber of Secrets" when she's making the potion in the bathroom with Harry and Ron, she's sitting criss-cross "applesauce" and you can see her panties.