Church of Jesus Christ of Latter Day Saints.
Mormon is the name of the prophet in The Book of Mormon after whom the book is named. According to the book's title page and the account of Joseph Smith, Jr. (who claimed to be the book's translator), Mormon was the prophet-historian who engraved the book on Golden Plates. Most Latter Day Saints believe that Mormon was an actual Nephite prophet who lived in the Americas circa 400 AD. Non-Mormon scholars, as well as some churches that follow the Latter Day Saint movement, particularly within the Community of Christ, consider Mormon to be a fictional character.
The Book of Mormon reports that Mormon was instructed by the prophet Ammaron where to find the records that had been passed down from their ancestors. It also claims that Mormon later abridged the near-millennium-long history of his ancestors, a more ancient people, and additional revelations into the Book of Mormon. The divisions of Mormon attributed to the prophet are the Words of Mormon and the first seven chapters of the larger book. Mormon eventually passed all of the records on to his son Moroni.