Throughout the Book of Mormon, the descendants of Laman, son of Lehi, are called Lamanites. Into this group were integrated the descendants of other family lines, including those of Lemuel and Ishmael. Jacob, brother of Nephi and Joseph, wrote concerning the various branches of the offspring of Lehi and his followers.
Now the people which were not Lamanites were Nephites; nevertheless, they were called Nephites, Jacobites, Josephites, Zoramites, Lamanites, Lemuelites, and Ishmaelites.
But I, Jacob, shall not hereafter distinguish them by these names, but I shall call them Lamanites that seek to destroy the people of Nephi, and those who are friendly to Nephi I shall call Nephites, or the people of Nephi, according to the reigns of the kings.