Earlier name of the Mountains of Shadow in Morder in Lord of the Rings drafts from the 1940s (WR/122, 180), a combination of hebel (“?fence”) and dú(w)ath “night-shade”.
Noldorin
duath
place name. Duath
eryd-lómin
place name. Mountains of Shadow
hebel dúath
place name. Mountains of Shadow
The earliest Elvish name of the Mountains of Shadow in Morder in Lord of the Rings drafts from the 1940s (TI/309, TI/343), it is simply dú(w)ath “night-shade” used as a name.