Why is there such a strange phenomenon in Manchu that grandpa's surname is Mi, dad's surname is Li and son's surname is Fu?

This is not uncommon. The naming system of Manchu is different from that of Han nationality. Later, after the Qing army entered the customs, Manchu gradually became Chinese, and their life and culture were affected to varying degrees, so it was normal for this to happen.

Because they are all, but their surnames, Mi, Li and Fu are all part of their names. In Biography of Yan Xi Palace, Fu Cha has a younger brother named Fu Heng. Maybe everyone doesn't know that this Fu Heng's father is called Li Rongbao, and their grandfather is called Mishan.

Obviously, it is a family, and the names are very different, which makes people wonder. Are they really not a family? Actually, they aren't, because their names are all Fu Cha. Fu Heng's name should be Fu Heng, Fu Cha, and his father Li Rongbao should also be Fu Cha. So their usual names are not called with their first names, but they hide their last names.

Manchu people are used to replacing surnames with first names, which leads to the evolution of various false surnames. After all, Manchu and Han people have different living customs. There is a big difference in names. Fu Heng belongs to the Fu Cha family, so everyone in their family should be called Fu Cha.

Another adult, another adult's son named Feng?enyende, is a veritable father and son, but not the same surname. The reason is that Manchu's living habits have been gradually integrated by Han Chinese, and when they begin to call their names, they no longer call their surnames. And adults and his son Feng?enyende are actually the same surname. They are all family members of Niuhulu. Manchu names are relatively long, and in order to better address them, they were later changed into convenient names for Han people.

So it is normal for a family to have different surnames in ancient families, because their real surnames are hidden.