The Huyan (Chinese: 呼衍、呼延; Wade–Giles: Huyen) was a noble house that led the last remnants of the Northern Xiongnu, to Dzungaria during the 2nd century, after the Battle of Ikh Bayan. The noble clan of Huyan, is an earlier maternal lineage or last name, subsequently replaced by Suybu tribe, much as the Ashina (阿史那) and Yujiulu (郁久閭).
By the 3rd century BCE, the upper stratum of the Xiongnu was made up of five aristocratic houses, the Luanti (攣鞮, house of Shanyu and the Tuqi of the east and west), Huyan (呼衍, Tr. Kuyan = Jack rabbit), Xubu (須卜, Tr. Suibu, Suybu = Yui Tribe), Qiulin (丘林) and Lan (蘭, Tr. Lan = Orchard). Both noble houses of Huyan (Kuyan), and Xubu (Suybu), settled in the east, Qiulin and Lan in the west, while Luanti at the center of Mongolia.
Read more about Huyan: Prominent People With Family Name Huyan