Sutean language
The Sutean language (Sutû) is mentioned by a clay tablet from the Middle Assyrian Empire, presumably originating from the city of Emar in what is now north-east Syria, among a list of languages spoken in the region. The other languages are Akkadian, Amorite, Gutian, "Subarean" (Hurrian), and Elamite. The Sutean people may have lived in the region of Suhum. Their language is only known from names, most of which are Akkadian or Amorite. The few which are neither also appear to be Semitic; it's possible that they were Aramaic.
References
Wolfgang Heimpel (2003), Letters to the King of Mari: A New Translation, with Historical Introduction, Notes, and Commentary. Eisenbrauns.