What does Han mean by Han?

Liu Bangjian was named Hanwang before the Han Dynasty and made a fortune in Hanshui area. The Han Dynasty was powerful, and the Central Plains was called Han by foreigners. Han, that's the point. ... not only the Han dynasty called the Han nationality, but because this Han dynasty conforms to a certain meaning, the Han nationality became a general term. Just like today's fashion, taking out an element does not necessarily become fashion. It is popular because an element must conform to the market. For example, in Zhou's 800 years, you can't say that he is not strong, but Zhou's clan is not popular. Chinatown has gone abroad and can be called Tang people, but Tang people have not become popular. ..... Han has the meaning of the Milky Way. China was once called China. In China mythology, the North Pole, the South Pole, Wei Zi and the four heavenly kings are the Milky Way.