Convert from English to One of the Elvish languages. For his novel Lord of the Rings J. R. R. Tolkien constructed many Elvish languages. These were the languages spoken by the tribes of his Elves. Sindarin and Quenya are two of the major languages spoken by the Elves. Here you can find Elvish Translators for Sindarin and Quenya.
If you want to name an elf check out Elf name generator.