A revised name for the father of Nerdanel in notes from 1968, earlier named Mahtan which is the form Christopher Tolkien used in The Silmarillion (PM/366). The meaning of this name are unclear, but it might be related to the root √SAR.
References ✧ PM/366; PMI
Related
‽Sarmo was most widely known as Urundil “Copper-lover” ✧ PM/366