J.R.R. Tolkien created Quenya for the Elves of Valinor and based it partly on Finnish.
Quenya is one of Tolkien’s most developed constructed languages. Within his mythology it was spoken by the Ñoldor and other Elves connected with Valinor, the Blessed Realm. Tolkien shaped its sound and grammar partly through his admiration for Finnish, while also drawing on other linguistic influences.
Quenya is not identical to Finnish. Tolkien borrowed inspiration, including some phonetic and grammatical ideas, then developed a separate vocabulary, history, and writing tradition for his fictional world. Its internal history includes changes associated with different Elvish communities and periods.
Sindarin is the main language that readers commonly contrast with Quenya. Sindarin was derived from Tolkien’s imagined Common Eldarin history and was influenced in sound by Welsh. In The Lord of the Rings, characters use both languages in different settings, and many names or ceremonial phrases are Quenya even when everyday speech is Sindarin.