J.K. Rowling has never released this information.
Some fans believe they wanted their children's names to start with R & H like their own names. It is also believed that their daughter is named Rose, another type of flower, to honour Lily Evans'
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The reason for Rose's name was never specified, but it is thought that it may be in honour of Lily Evans. It is also possible that their children were given names with the same initials as their parents (Ron and Hermione - Rose and Hugo.)
Harry and Ginny called their kids James and Lily, after his parents and Albus Severus his headmasters at Hogwarts.
Harry Potter and Ginny Weasley married and had 3 children. Lily Luna Potter, Albus Severus Potter and James Sirius Potter. Ron Weasley and Hermione Granger married and had 2 children. Rose and Hugo Weasley Luna Lovegood Married Rolf Scamander (relative of newt scamander) and had 2 children Lysander and Lorcan Scamander Neville Longbottom married Hannah Abbot. it is however unknown if they have any children. The rest of their friends are either unknown after the wizarding war or deceased.
Harry Potter had two sons and one daughter after he married Ginny. The first son was James Potter, named after Harry's father. His second son was Albus Potter, named after Albus Dumbledore, the headmaster for six of the years Harry was at Hogwarts. (Albus'es middle name was Severus, named after a headmaster and teacher.) Harry's daughter's name was Lily, named after Harry's mother.
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.
Hermione Jean Granger is her real name. The actor who played her is called Emma Watson.
The character is called Hermione Granger. The actress is Emma Watson.