According to textual research, the descendants of Tang Yao were still an independent country named Tang Dou when Zhou Wuwang was just established, and it was not until Zhou Chengwang that they were eliminated and incorporated into Zhou territory. The descendants of Tang Du were renamed Du. Du Guo, now located in Chang 'an, Shaanxi Province, was the Ling Du of the Han Dynasty. Later, Du Guo was destroyed, and the descendants of Du surname ran away, and Du surname came out from now on.
Extended data
Du ranked 129 among the top 100 surnames in Song Dynasty. During the Spring and Autumn Period and the Warring States Period, Du people migrated to parts of Hubei, Henan, Anhui, Jiangxi, Shandong, Sichuan, Jiangsu, Zhejiang and other places. During the Qin and Han Dynasties, Du people mainly lived in Shaanxi. During the Wei, Jin, Southern and Northern Dynasties, wars were frequent. In order to escape the war, Du people moved to Hubei, Sichuan and Zhejiang on a large scale, and formed a big family there. At the end of the Tang Dynasty, a man named Du moved to Shaoxing, Zhejiang.
Du's county names mainly include Jingzhao County, Xiangyang County, Puyang County, Hanyang County and Nanyang County. The surnames of Du family mainly include Jingzhao Hall, Xiangyang Hall, Puyang Hall, Hanyang Hall, Nanyang Hall, (Shaoling Hall), Tang, Zhendetang and so on. During the Western Han Dynasty, the Du family in Jingzhao had moved to Sichuan and gradually formed the Du family.
References:
Baidu Encyclopedia-Du surname