(FYI it's Mormon*, named after the Book of Mormon)
However, (also FYI), adherents prefer if you refer to the church as "The Church of Jesus Christ of Latter-day Saints" and members of said church "Latter-day Saints" or simply "Christians".
I know "Mormon" is a long-standing nickname and most people don't intend to use the term derogatorily, but calling Latter-day Saints "Mormons" is like nicknaming Muslims "Mohammeds" or "Qurans" or nicknaming Islam "the Mohammed Church" or "the Quran Church".
However, (also FYI), adherents prefer if you refer to the church as "The Church of Jesus Christ of Latter-day Saints" and members of said church "Latter-day Saints" or simply "Christians".
I know "Mormon" is a long-standing nickname and most people don't intend to use the term derogatorily, but calling Latter-day Saints "Mormons" is like nicknaming Muslims "Mohammeds" or "Qurans" or nicknaming Islam "the Mohammed Church" or "the Quran Church".