ermabuin

masculine name. One-handed

Predecessor to the name S. Erchamion. In The Etymologies, the form Ermab(r)in “One-handed” was marked Ilkorin (Ety/MAP), and the similar form Ermabuin from the narratives may also be Ilkorin, since it appeared beside the Ilkorin name Mablosgen “Empty-handed” (LR/131). This name is a compound of er “one”, mâb “hand” and a variation of the adjective suffix -en. The u might be explained as a fossilized dual element [u], but the absence of this vowel in The Etymologies may mean that Tolkien rejected it in the Ilkorin form of the name.

er Reconstructed

cardinal. one

The Ilkorin word for “one” attested only in the name Ermabuin or Ermab(r)in “One-handed” (Ety/MAP).

gelion

adjective. bright

An adjective meaning “bright” derived from the root ᴹ√GAL, the basis of the river name Gelion (Ety/GYEL). There isn’t enough information to deduce its primitive form, but Helge Fauskanger suggested ✱✶galjānā (AL-Ilkorin/gelion), which seems reasonably plausible.