“Why does the Church have such a long name?” Liahona, Apr. 2013, 61
Jesus Christ Himself named the Church (see Doctrine and Covenants 115:4).
The words Church of Jesus Christ declare that it is His Church.
Of Latter-day explains that it is the same Church as the Church that Jesus Christ established when He lived on earth but restored in these latter days.
Saints means that we follow Him and strive to do His will.
Our members have been called Mormons because we believe in the Book of Mormon, but we should use the full name of the Church whenever possible.