What is the most populous surname in China? Why?

In China, the most populous surname is Wang. By March 3rd, 2023, according to the data released by the National Bureau of Statistics of China, the population of "Wang" was about 92.5 million, accounting for 6.57% of the total population. So why are there the most people named "Wang"? This is mainly because under the ancient feudal system in China, the throne was above the ruling class, so in the long history, a large number of emperors and nobles named after the word "Wang" appeared, and these people inherited the word "Wang" as their surnames. In addition, the word "Wang" is easy to write and read, which also leads to the popularity of this surname in many places.