The fictional author of Fantastic Beasts in J.K. Rowling’s wizarding world is Newt Scamander, so his first name is Newt.
Newt Scamander is presented as the author of Fantastic Beasts and Where to Find Them, a textbook used by Hogwarts students. Rowling published a charity companion book under that fictional authorship in 2001. The character later became the protagonist of the Fantastic Beasts film series, beginning with the 2016 movie.
In the films, Newt is a magizoologist who studies magical creatures and travels with a case containing several of them. His expertise and gentle manner contrast with the more traditional action-hero image often associated with fantasy protagonists. Eddie Redmayne portrayed Newt in the film series.
Readers sometimes confuse Newt with other prominent first names in the wizarding world, including Albus Dumbledore, Rubeus Hagrid, and Gellert Grindelwald. Newt is not a Hogwarts professor or one of Harry Potter’s classmates; he belongs to an earlier generation and has a separate storyline.