The Zhou had eight [worthy] scholar-officials: the Eldest-Sons Da and Kuo, the Second-Sons Tu and Hu, the Third-Sons Ye and Xia, and the Youngest-Sons Sui and Gua.Confucius, & Slingerland, E. (2003). Analects: With selections from traditional commentaries. Hackett Publishing.
The Zhou had eight men of station: elder brother Da and elder brother Kuo; middle brother Tu and middle brother Hu; younger brother Ye and younger brother Xia; youngest brother Sui and youngest brother Kuo.Confucius, & Watson, B. (2007). The Analects of Confucius. Columbia University Press.