The Elvish language associated with Tolkien’s High Elves is Quenya.
Quenya is one of Tolkien’s constructed languages and is strongly connected with the Ñoldor and other High Elves. Tolkien developed its vocabulary, grammar, sound system, and historical relationships over many years. Its influences include Finnish, Latin, and Greek, although Quenya is an original language rather than a direct copy of any of them.
Within the history of Middle-earth, Quenya was an ancient and prestigious language. In later ages, it remained important in formal, poetic, and ceremonial contexts even when Sindarin was more widely spoken among many Elves in Middle-earth. Names such as Eärendil and phrases such as “Namárië” are associated with Tolkien’s Elvish linguistic work.
Quenya is often confused with Sindarin because both are major Elvish languages in Tolkien’s writings. Sindarin became the everyday Elvish language of many Elves in Middle-earth, while Quenya generally carried an older, more formal status.