A name for a river in Beleriand, replacing earlier Ilk. Eldor/Eglor (SM/227) and replaced in turn by the name S. Nenning (WJ/117). It appears to be a combination of the prefixal form Egla- of Eglan “Forsaken (Elf)” and the lenited form -hir of sîr “river” also appearing in names such as Linhir and Nanduhirion.
eglahirplace name. Elf-river