Some words will be listed in the family tree in a certain order, and each generation in the future will rank and name according to the order of these words, so that you can know which generation it is just by looking at the words in the name, which is very useful for etiquette in a big family. After all, everyone in a family is born differently sooner or later. If you don't do this, it will be difficult to distinguish the Qing Dynasty after several generations.
Now that families are getting smaller and smaller, this custom is not so important.