Renesmee (pronounced Ruh-NEZ-may) "Nessie" Carlie Cullen is a member of the Olympic coven. She is the second daughter of Isabella Cullen and Edward Swan, the younger sister of Solara Cullen, and the sister-in-law of Sabrina Volturi. On the maternal side, Renesmee's biological grandparents are Ed Swan and Elizabeth Targaryen, with her maternal step-grandfather being Remus Targaryen, while on the paternal, they are Charlie and Renée Masen. She is also the adoptive granddaughter of Carlisle and Esme Cullen and the adoptive niece of Jasper and Rosalie Hale and Alice, Brianna, and Emmett Cullen.
- "Her name is Renesmee. Like Renée and Esme put together."
Renesmee's name derives from an amalgamation of the names of Bella's mother, Renée, and her adoptive mother, Esme. Her middle name, Carlie, is a portmanteau of Bella's father, Carlisle, and Charlie, Bella's biological father. Her full name is Renesmee Carlie Cullen. Jacob Black has given her the nickname "Nessie" because he thinks her full name is "mouthful". At first, Edward refuses to use this nickname because of the obvious allusion to the Loch-Ness Monster, but by the end of the story he eventually warms to it. The nickname and Jacob's imprinting on her made newborn Edward furious enough to attempt to attack him. Luckily for him, and to Renesmee's relief (as she later tells Edward), Seth, Jacob's friend, jumped in the way, breaking his shoulder and hand bone in the process (which Edward quickly apologizes for after calming down).