This surname is the surname An, and in china, surname and surname were different. Surnames are passed down from generation to generation, but they can change with the change of official position and fiefdom. The original origin of the Chinese surname is based on the primitive religion, totem, ancestor worship of the "Heavenly Dao", and the surname is a specific symbol used to distinguish the clan.
There are also many origins of the An surname, one of which is the original surname, and the more famous one is An Qisheng of the Qin Dynasty. An Zhisheng is a philosophical descendant of Huang Lao's family and the founder of Fang Xian Dao. Qin Shi Huang was very superstitious and often pursued immortality, and Qin Shi Huang once sent three thousand people to follow Xu Fu out to seek the elixir of immortality. An Qisheng was a man who had a great influence on the activities and formation of the Qin Han Yan Qi fangshi, and he was also valued by Qin Shi Huang.
The other lineage is not the descendants of the Chinese, but the descendants of the West Asian Sabbath Kingdom. During the reign of Emperor Wu of Han, Liu Che devoted himself to the development of the Silk Road, which existed long ago, but has not been very large, and emperor Wu of Han took this issue into account after he ascended the throne. Because there are nearly 50 countries in the Western Regions, the connection between the Central Plains and the Western Regions was blocked because of the Xiongnu. So Emperor Wudi of the Han Dynasty sent a large army to attack the Xiongnu, and then conquered the countries in the western region controlled by the Xiongnu.
In the sixth year of the Yuan Dynasty (105 BC), the Silk Road was opened, and after the Silk Road was opened, it brought great benefits to the Western Regions and the Western Han Dynasty. There were many merchant exchanges between the two sides, and the later Han Dynasty also used the Silk Road to have many contacts with the countries in the western region. It was also at this time that China also had exchanges with the Sabbath, also known as the Parthian Empire. It was a slave country in the classical period in the Iranian region of western Asia, and when the Sabbatarian state was transmitted to Anqing, this prince did not like to be a king.
He wanted to be a monk, so he gave the throne to his uncle. In the second year of the Eastern Han Dynasty (148 AD), Liu Zhijian, the Huan Emperor of the Eastern Han Dynasty, came to Luoyang, China to propagate, and also settled here. His descendants have lived in China for generations, and some of the bodyguards who followed him to the Han Dynasty also used the original An character of the Sabbath Kingdom as their surname. Up to now, there are still some people who take An Qing as the ancestor, so some of the descendants of the An surname are actually descendants of Iranians.
However, it is not all, and some of them are native, in addition to the original, there is also a change of surname. During the Tang Dynasty, there were nine surnames of Zhaowu, which were Kang, An, Cao, Shi, Mi, He, Huoxun, Pengdi, and Shi. This was a foreign surname during the Tang Dynasty, and later became an an surname in the Central Plains after sinicization and the original name anguo as a clan.
The most famous of this group of people surnamed An should be An Lushan, that is, An Lushan, the culprit who launched the An Shi Rebellion. He is a descendant of Kang Guo in the "Nine Surnames of Zhaowu", following his stepfather's surname as An, and his descendants directly use the An surname as a surname, which has also been used until now.
References: New Book of Tang, History