Kim: This is a dynasty based on Jurchen in the history of China, not the name of a nation. As we say now, China people are not the names of a particular nation, but the names of a country.
Jurchen: This is an ancient national name in the northeast of China. It has historical origins with Su Shen, Lou Lou and Bu Jihong. In the Five Dynasties, the Khitans called Heishui Mohong Jurchen. Since then, the name Jurchen has replaced Mohong.
Man: 1583, Nuerhachi started his army, gradually unified the ministries of Jurchen, and established the Eight Banners system of military and political integration. 163510 June 13, Huang taiji claimed to be the emperor and changed his country name to Manchu. After the founding of the Republic of China, Manchu was unified and changed to Manchu, which has been used ever since.
Flag: This is not the name of a nation, although it also refers to Manchu, such as flag bearer. This title comes from the Manchu Eight Banners system.