Headline said:
It's funny that "Yue" keeps moving south
Yue was around the sea coast south of Yangtze river during the Spring and Fall era. Then with every dynasty change, the ruler would name some place south Yue when the people around there weren't from the original Yue. Vietnam was given the name "Nam Yue" during Chinese rule.
Actually, in pre-imperial times, the entire coastal stretch fr the Yangzi to N Vietnam was inhabited by a people who seemed culturally uniformed. After the Chinese conquered the Guangdong area and the Yangzi delta, it seemed that this people broke up and went their separate ways - mostly becoming Chinese, some headed for SE Asia, some becoming the Vietnamese etc.
It is also funny that Chinese were pretty ignorant about barbarians. They pretty much named every other race that invaded China "Hun" just for the sake.
That's very untrue. The Chinese paid especial attention to the steppe tribes. They even had a special agency to keep track of who's what where in the frontiers, since these tribes were always China's greatest threat.
And 'Hun' wasn't even a Chinese term.
Note that when the Russians arrived landwardside, the Chinese (Manchus really) quickly recognized them as a distinct people (and potential enemy), fought a brief war to drive the Russians back out of the Amur, established a treaty with the Russians (in 5 languages - Chinese, Manchu, Mongol, Russian and Latin), established a school to learn Russian in Beijing and allowed the Russians to set up a 'Russian Hostel' in same city. They took the north very seriously, and in those decades were in a struggle with Russia over the Mongols' allegiance.
Note the wide difference in treatment of when the British attempted an audience, much later...