Jacom was one of the four sons of Jared, listed with Gilgah, Mahah, and Orihah (Ether 6:14). His family came to the promised land among the company of Jared and the brother of Jared.
When the people asked that one of the sons be anointed king, the brother of Jared answered that the request would lead into captivity, but Jared told them to choose a king from among the sons (Ether 6:23). The firstborn of the brother of Jared refused, and so did his brothers; the sons of Jared also refused, all but one. Jacom was among those who would not reign, and his brother Orihah was anointed king instead (Ether 6:27).