The name of J.R.R. Tolkien’s language used by many High Elves in Middle-earth is Quenya.
Quenya is one of Tolkien’s best-developed Elvish languages. He based much of its sound and structure on Finnish, while also drawing on other language traditions and his own linguistic invention. In the stories, it is associated especially with the Elves who departed for Valinor and with formal, literary, or ceremonial speech.
Sindarin is a different Elvish language and became more widely spoken among many Elves in Middle-earth during the later ages. Because both languages are connected to Tolkien’s Elvish history, they are frequently mixed up in general discussions of his legendarium.
Quenya appears in names, poems, inscriptions, and ceremonial phrases across Tolkien’s writings. Its fictional history is also detailed: it developed from earlier forms of Elvish speech and is related to other languages in Tolkien’s constructed family.