Precursor to the river name Anduin appearing in the Lord of the Rings from the 1940s (RS/410), a combination of beleg “great” and the lenited form of sîr “river”.
Noldorin
sirion
place name. Sirion
sirion
noun. great river
eithel sirion
place name. Sirion’s Well
siriombar
place name. Sirion’s Haven
sîr
noun. river
anduin
place name. Great River
beleghir
place name. Great River
celon
noun. river
duirro
noun. river-bank
sîr
noun. river
Name of the settlement of Tuor and the remnants of Doriath at the mouth of the river Sirion appearing in a name list from the 1930s (LR/407), a combination of that river name and bár “home”.