Xiong-Nu
Xiong-Nu was an unclassified language once spoken in Mongolia.
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Xiongnu, also referred to as Xiong-nu or Hsiung-nu, is the language(s) presumed to be spoken by the Xiongnu, a people and confederation which existed from the 3rd century BCE to 100 AD. It is sparsely attested, and the extant material available on it comprises about 150 words, as well as what may be a two-line text transcribed using Chinese characters, which the Xiongnu may have used themselves for writing their language.
From Wikipedia · Xiongnu language · CC BY-SA 4.0