Before the Han Dynasty, there were very few people surnamed Liu. After the Han Dynasty, Liu became the most popular name in China. It can be said that most people surnamed Liu are descendants of the royal family in the Han Dynasty. During the Han Dynasty, the royal family was made king or marquis, which spread all over the country. After they arrived at their respective fiefs, they continued to form families to have children, and superior living conditions ensured the number of offspring. So now there are people named Liu all over the country.