Lehi in the Desert, Nibley, pp. 148-149; Companion to Your Study of the Book of Mormon, Ludlow, p. 309
“Incidentally, the genealogy in Ether, chapter one, explains why neither the brother of Jared nor his children are ever named… . It is, of course, because ‘he that wrote this’ is a direct descendant of Jared (1:2, 32), and not of Jared’s brother, and is giving the history of his own line only.” (Hugh Nibley, Lehi in the Desert, pp. 149-150)
“While residing in Kirtland, Elder Reynolds Cahoon had a son born to him. One day, while the Prophet Joseph Smith was passing by his door, he called the Prophet in and asked him to bless and name the baby. Joseph did so and gave the baby the name of Mahonri Moriancumer. When he had finished the blessing he laid the child upon the bed, and turning to the father, Elder Cahoon, he said, ‘The name I have given your son is the name of the Brother of Jared; the Lord has just shown (or revealed) it to me.’ Elder William F. Cahoon, who was standing nearby, heard the Prophet make this statement to his father; and this was the first time the name of the Brother of Jared was known in the Church in this dispensation.” (George Reynolds, Commentary on the Book of Mormon, 6:69)