Hermione Jane Granger was born on 19th September, 1979. Hermione is a student at Hogwarts School of Witchcraft and Wizardry and, along with Ron Weasley, is one of Harry Potter’s best friends and at times the mother hen of the trio. She is slightly bossy and very studious. Her thirst for knowledge proves useful in many of their adventures, but an innate fear of failure also causes her to lose her nerve whenever a major test is called for.

She is described upon her first appearance as having “lots of bushy brown hair and rather large front teeth.” Many at the school have teased her for her looks, including, on one occasion, Professor Snape. She eventually magics her teeth to “normal size,” and, with her application of magical hair straightening solution for the Yule Ball, even Harry and Ron noticed she was pretty.

She is also teased for her “know-it-all” tendencies, but is admired in equal measure for her intelligence. She received top grades in all of her Ordinary Wizarding Level exams except for Defence Against The Dark Arts, where she received the second-highest grade. Neville, Harry, and Ron depend on her for academic help. By her sixth year at Hogwarts, she is generally acknowledged to be the best in her class. She also seems to have a growing romantic interest in Ron Weasley.

Hermione is Muggle-born, that is, the child of two non-magical parents, both dentists. Hermione’s parents seem to be accepting of her magical abilities, but they have never been given much “page time.” J. K. Rowling noted she initially considered giving Hermione a younger sister, but now believes it’s “too late.” Therefore, it’s usually considered canon that Hermione is an only child.

Hermione’s name is pronounced “Her-my-oh-nee”, as readers find out in Harry Potter and the Goblet of Fire. This was the most frequently asked question J. K. Rowling received, so in this book she cunningly had Hermione teach Viktor Krum how to pronounce her name properly (without much success). Rowling said she obtained it from William Shakespeare’s The Winter’s Tale, claiming that she wanted it to be unusual, since if fewer girls shared her name, fewer girls would get teased for it. “Hermione”, appropriately, is derived from “Hermes”, the Greek god of invention, inspiration, eloquence and quick thinking.

Hermione is actually the eldest of the trio; for years it was widely assumed that she was born in September 1980, the same year as Ron and Harry. However, J.K. Rowling pointed out that to attend Hogwarts, one must be eleven years old, and Hermione’s birthday was in 1979. Therefore Hermione was nearly twelve when she began school in September 1991. Many fans found this detail a source of debate, with many arguing that it shouldn’t have mattered that a brilliant witch as herself would have been slightly younger than her classmates for the first three weeks of the school year, had she been born the same year as them.

Hermione’s name was originally going to be ‘Hermione Puckle’ but it was changed by Rowling. “Puckle” is a term for a goblin or elf.

Hermione’s middle name, Jane, has never been mentioned in the books, only on JK Rowling’s official site. At one point, JK Rowling considered just naming her Jane Granger.

JK Rowling has admitted that Hermione is “a bit like” Rowling herself.

Rowling has revealed on her website that Hermione’s wand is made of vine wood with a dragon heartstring core. Each of the trio’s wands have one of Ollivander’s preferred cores: phoenix feather (Harry), unicorn hair (Ron), dragon heartstring (Hermione). Her wand’s wood, vine, is the wood ascribed to her birth month in the Celtic calendar.

Source: Wikipedia