Common Eldarin
From Tolkien Gateway
Common Eldarin is the primordial tongue of the Eldar, those Elves who left for Valinor.
Common Eldarin split off Primitive Quendian, the original language of all Quendi, or Elves, when the Eldar left Cuiviénen.
Common Eldarin led to the later languages Quenya, Telerin, Sindarin, and various Nandorin languages.
See also: Languages
