J.R.R. Tolkien based Quenya strongly on Finnish and used it as a major language in his mythology.
Quenya is one of Tolkien’s Elvish languages and is associated especially with the High Elves, including the Noldor. Tolkien began developing it during the 1910s, drawing on Finnish grammar and sound patterns while also shaping it through influences from Latin, Greek, and other languages. It was not merely a vocabulary list; Tolkien created grammatical structures, historical changes, and related forms.
Sindarin is another major Elvish language, but Tolkien modeled much of its sound on Welsh rather than Finnish. Quenya often functions as a formal, ancient, or ceremonial language in the stories. Phrases such as “Namárië” demonstrate its literary use.
The language names can be confused because both Quenya and Sindarin are Elvish tongues. Quenya is the specific answer when Finnish influence is the clue.