The Lingojam website offers a Tel'Quessir elvish translator, and the Chosen of Eilistraee website offers a Drow Elf translator. The Tel'Quessir translator is from "The Forgotten Realms", while the Eilistraee translator is from "Neverwinter Nights", both of which originated from "Dungeons and Dragons" lore.
There are many variations of the Elvish language. The Grey Company website explores different dialects of the language and offers a comprehensive list of translations. The Alpha Dictionary features a translation guide to Quenya, which is the language of the Elves in J.R.R. Tolkien's Middle Earth. The entirety of Quenya, including grammar usage, was solely created by Tolkien.