Uyghur people
During the Northern Wei period in the 6th century, Anchi/Anzhi (安迟) was the Xianbei surname of Uyghur people (回鶻人) a division of the Hui people; they later reduced the surname to An (安). During the Tang Dynasty in the 8th century, the An (安) family name was used among the Xueyantuo (薛延陀) people.