Melkian

In an older version of J.R.R. Tolkien's conception of the Languages of Middle-earth as expounded in the Lhammas, Melkian (also known as Orquin or Orquian) is the language which was named after the fallen Vala Melkor (Morgoth). It had its origins from corrupted Valarin. It was spoken by him and his servants and is the predecessor of many of the dialects of the Orcs and other evil beings.

Though it seems this concept was later dropped by Tolkien, in the late text labelled Ósanwe-kenta it was mentioned that Melkor indeed had developed a language for those who served him by the time of the War of the Powers, as Manwë himself told the Eldar.