In the books and in the films Hermione is always called Hermione she is never once called 'Mione. The only person who doesn't call her Hermione is Grawp who calls her Hermy because Hagrid told him that was his name because he felt Hermione would be too hard for him to say. Everyone else calls her Hermione! This one for some reason really annoys me. So remember her name is Hermione not 'Mione.