Huns are Mongolians now. What was the name of Northeasters in ancient times? It would be better to know Heilongjiang.

Both Huns and Mongols originated from grasslands, but they are not a nation. There are many ethnic groups in the grassland, including Turkic, Khitan, Jurchen, Mongolia and Tangut (Uighur). They are different nationalities, not different names of a nation at different times.

Northeast China belonged to Koguryo (also a local dynasty in China) before the Tang Dynasty, and was incorporated into the territory of the Tang Dynasty to set up the Heishui Duhu House, which belonged to Bohai State in Song and Liao Dynasties. There are also many ethnic minorities in Northeast China, such as Nuzhen (the ancestor of Manchu), Oroqen, Ewenki and so on.

If you are interested, you can listen to Yuan Tengfei's "Three Dynasties in Saibei" and have a general understanding of the ethnic minorities in ancient northern China.