The ordinary Sindarin form of Dor-lómin, which was itself a name in the North Sindarin dialect (PE17/133). This name is a combination of dôr “land” and loven “echoing” (RC/625).
Conceptual Development: In The Etymologies from the 1930s, Tolkien similarly differentiated between ordinary Noldorin Dorlamren (containing the lenited form of N. glamren) from Dor-lómen, which was the Noldorized form of Ilkorin Lómendor (Ety/LAM).
Quenya name of Dor-lómin (WJ/145). It is probably a combination of the North Sindarin word NS. lómin “echoing” with Q. nórë “land”. The Quenya word for “echoing” is elsewhere given as [ᴹQ.] lámina (Ety/LAM).