Eregion in Other Languages
 

Eregion, alas, is another of the subjects about which I wish Tolkien had written much, much more. I know of only two names: Eregion (Sindarin) and Hollin (Westron) for the land.

What did the dwarves call Eregion? Were there any other names found in some of Tolkien's more obscure notes?

In HOME V The Lost Road and Other Writings an alternate Elvish name of "Regornion" is given. I don't have that particular volume, so I'm unsure of the translation. It was called by Tolkien "Nan-eregdos" in a draft of The Ring Goes South. I'm not aware of any Dwarven name.

Thanks, Inzil.

I'll just continue to idly hope that the Tolkien estate discovers a crate of notes somewhere, written in JRR's hand, entitled "Celebrimbor and the Rings of Power", "Of Eregion and Hadhodrond", and "The Siege of Eregion".

A few hundred pages each would be nice.

The HoMe V quote is from the Etymologies, stem EREK- :

Note that here 'Eregion' is said to be Doriathrin; this text dates from before the change of Noldorin->Sindarin. The 'Eregion' mentioned here is not the Second Age kingdom in Eriador, but the forest that made up the greater part of Doriath; it seems to be identical in etymology and signification with 'Region', the more familiar name for that forest.

We don't know when the further addition 'Regornion' was made. It's obviously an alternate form, with the same etymology, of 'Eregion' and 'Region', but it's not clear whether it's intended to refer to the Doriathrin forest or the Noldorin kingdom, and it's not clear whether it was a (transitory) replacement for '(e)region', or another acceptable name alongside it. But that's probably not worth losing much sleep over; it clearly has the same etymology and meaning as 'Eregion'.

'Nan-eregdos' clearly also comes from the same root meaning 'holly'. I'm not sure what to make of the '-dos' element, but clearly the name means something like 'Vale of Holly'.

Unfortunately, none of this brings us any closer to a name for the kingdom in languages other than Sindarin and English (i.e. translated Westron).

Edit: The meaning of 'Eregdos' was right in front of me in the entry from the Etymologies, where it refers to root TUS- :

So 'Nan-eregdos' is 'Vale of Holly Trees'.