A Doriathrin variation of Region appearing in The Etymologies from the 1930s (Ety/ÉREK). It was translated “Hollin” and appears to be the genitive plural of Ilk. regorn “holly-tree”.
Doriathrin
regorn
noun. holly-tree
regornion
place name. Hollin
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A Doriathrin noun meaning “holly-tree”, a combination of (archaic?) reg “holly” and orn “tree” (Ety/ERÉK, ÓR-NI).