J.R.R. Tolkien developed Quenya as an Elvish language strongly influenced by Finnish.
Quenya is one of Tolkien’s most fully developed constructed languages. Within his mythology, it is associated especially with the High Elves and is related to the earlier language spoken by the Eldar. Tolkien shaped its sound and grammar partly through his study of Finnish, while also drawing on Latin and Greek and on his own evolving linguistic theories.
Quenya appears in names, poetry, ceremonial speech, and songs throughout Tolkien’s writings. Familiar examples include “Namárië,” Galadriel’s lament in The Lord of the Rings, and the names Eärendil, Noldor, and Valinor. The language is not simply a code for translating modern English: Tolkien built historical relationships among languages and imagined how they changed over time.
Sindarin is the other major Elvish language in The Lord of the Rings and was influenced especially by Welsh. Khuzdul belongs to the Dwarves, while Black Speech was created for Mordor. These are related parts of Tolkien’s linguistic world, but Quenya is the Finnish-influenced answer.