Are the Huns and Manchus related?

It doesn’t matter.

The Xiongnu were a nomadic people in northern China in ancient China who arose in the foothills of Yinshan Mountain in present-day Inner Mongolia. According to records in "Historical Records: Biography of the Xiongnu", the Xiongnu were the descendants of their ancestors, the Xia Hou family, and were named Chunwei. In the Tang and Yu periods, there were Shanrong, yangxu, and Xunzhu, who lived in the northern barbarians and moved with livestock. The Xiongnu in ancient Chinese books were a powerful nomadic people who dominated the north of the Central Plains at the end of the Qin Dynasty and the beginning of the Han Dynasty.

The "White Mountains and Black Waters" in the northeastern region are the hometown of the Manchus. The origin of the Manchu can be traced back to Sushen more than 2,000 years ago and later to Yilou, Wuji, Mohe and Jurchen. The Sushen people are one of the earliest recorded residents of the Northeast. They live in a vast area north of Changbai Mountain, east of the sea, and in the Heilongjiang and Ussuri river basins. Sushen people are mainly nomadic hunters and herders. They are good at riding and shooting and have a brave nature.

Extended information:

The Huns in the Mongolian Plateau were gradually sinicized, and the Mongols, Turks, Khitans, etc. are all their descendants. This is also the "Hu" in Yue Fei's poem "Liu" and "Hongnu" refer to. The Xiongnu as a nation disappeared in northern China, but some of their surnames and cultural practices remained.

Helian Bobo, who founded the Great Xia Kingdom, had his descendants surnamed Liu. There are many people surnamed Liu in northern Shaanxi, and some of them may be descendants of the Xiongnu. After the Huns entered the Central Plains, they often took their tribes or clans as their surnames. For example, those with the surname Huyan and those with the surname Dugu may also be their descendants.

Baidu Encyclopedia-Hongnu

Baidu Encyclopedia-Manchu