Erebor

noun. lonely mountain

ereb (“isolated, lonely”) + or (from orod “mountain”)

erebor

place name. Lonely Mountain

Sindarin name of the “Lonely Mountain” (LotR/1072). The initial element of this name is clearly ereb “single, alone” (SA/er), and the second element is likely a shorter version of orod “mountain” (as suggested by David Salo, GS/376).

Conceptual Development: In The Etymologies from the 1930s, this name appeared as N. Erebras (EtyAC/ERE), while in Lord of the Rings drafts from the 1940s, this name first appeared as N. Dolereb (TI/306) before being revised to N. Erebor (TI/142, 152, note #2).

Elements

Word	Gloss
ereb	“single, alone, lonely, single, alone, lonely, [N.] isolated”
orod	“mountain”

erebor

place name. Lonely Mountain

Elements

Word	Gloss
ereb	“isolated”
orod	“mountain”

erebras

place name. Lonely Mountain

Earlier name for Erebor appearing in The Etymologies from the 1930s (EtyAC/ERE), a combination of ereb “isolated” and the lenited form of rhas “horn”.