Quenya is the fictional language of J.R.R. Tolkien’s that was strongly inspired by Finnish.
Tolkien was a professional philologist, and he designed his invented languages with detailed sound systems, grammar and histories. Quenya, associated especially with the High Elves, drew much of its phonology and structure from Finnish, while also reflecting influences from Latin and Greek.
Sindarin is another major Elvish language in Tolkien’s legendarium, but its principal inspiration was Welsh rather than Finnish. Khuzdul is the secret language of the Dwarves, and Adûnaic is associated with the people of Númenor. These distinctions matter because Tolkien created several related but separate languages.
Quenya is sometimes called “Elven-Latin” because of its elevated status and use in formal names, poetry and ceremony. Tolkien’s language invention came before much of his storytelling, making linguistic design a foundation of Middle-earth rather than a decorative addition.