Quenya was the J.R.R. Tolkien language especially influenced by Finnish.
Quenya is one of Tolkien’s most developed Elvish languages. Its sound patterns and grammar were strongly inspired by Finnish, while its vocabulary and history belong to Tolkien’s fictional world. In Middle-earth, Quenya was associated particularly with the High Elves and was treated as an elevated or ceremonial language.
Sindarin is another major Elvish language, but Tolkien based much of its structure and sound on Welsh rather than Finnish. This distinction is a common source of confusion because both languages are central to Tolkien’s mythology and appear in names, poetry, and songs.
Tolkien was a professional philologist who studied the history and structure of languages. He created languages for aesthetic and historical reasons, building fictional peoples and cultures around linguistic change. Quenya therefore has both an invented vocabulary and a carefully designed internal history.