1 porcelain theory.
Ancient China exported a lot of porcelain. Porcelain comes from Changnan (later renamed Jingdezhen). Because of language communication problems. A foreigner, selling porcelain in China, what is this? Chinese businessmen mistakenly thought that the other party asked him where he was from, so they answered Changnan. Foreigners call porcelain china (pronounced near Changnan).
China said.
The totem of Liao State in Northern Song Dynasty is wolf, and its voice is China. Moreover, Liao has super military superiority in North Asia, Central Asia and West Asia. Even though Jin destroyed Liao, it established the Western Liao in Central Asia and suppressed China and West Asia for decades. So China and westerners call China China, and then turn it into China.
3 Qin said.
In the Western Zhou Dynasty, he was made a viscount and raised horses for the Zhou royal family in the northwest frontier. It grew stronger in the battle of Xirong, and Qin was the gateway of China and West Asia, so it was normal to call China Qin.
In Arabic, China is called Sui Kingdom.
In Arabic, China is called Sui. Because when the Arab prophet Muhammad founded religion, the Sui Dynasty was enviable in military, economic and cultural aspects. So Arabs call China Sui. There is an Arabic saying that although knowledge is far away in the Sui Dynasty, we still want it. From this point of view, the first and third possibilities are higher.
In short, the world only respects and yearns for the strong.