The Hundred Family Surnames (Chinese: 百家姓), commonly known as Bai Jia Xing, also translated as Hundreds of Chinese Surnames, is a classic Chinese text composed of common Chinese surnames. The book was composed in the early Song dynasty. It originally contained 411 surnames, and was later expanded to 504.[when?] Of these, 444 are single-character surnames, and 60 are double-character surnames. About 800 names have been derived from the original ones.