Sindarin was J.R.R. Tolkien’s fictional language associated with the Sindar.
Sindarin is one of the major Elvish languages of Middle-earth. It developed from Common Telerin and was spoken by the Sindar, the Grey Elves of Beleriand. Tolkien based much of its sound and historical development on the Welsh language, while Quenya was influenced especially by Finnish and Latin.
During the Third Age, Sindarin was widely used by Elves in Middle-earth and was also known to some Men. Many familiar names, including Aragorn, Galadriel, and Mordor, derive from Tolkien’s invented linguistic systems, although names can involve several related language histories.
Sindarin is often confused with Quenya because both are Elvish languages and both appear throughout Tolkien’s mythology. Quenya is associated particularly with the High Elves and has a more formal or ancient role in many contexts. Sindarin is the more commonly spoken Elvish language in much of the later history of Middle-earth.