What is "coriantumr"

In the Book of Mormon, Coriantumr is the name of three figures that appear throughout the book's narrative. Chronologically, these three are: one of the sons of Omer, a deposed Jaredite king later restored to his throne by his sons Esrom and Coriantumr; the last of the Jaredite kings, who lived to see his people destroyed and to see another people live in the land; and a Nephite dissenter, who was made leader by the Lamanites over the Lamanite armies.