The population of Chu surname is 230,000. Reference/x000/2008files/20090521095523235. HTML surnames come from the ancient state of Chu, and China people take the country name as their surnames. During the Spring and Autumn Period, there was Chu Jun in the State of Qi, and his descendants took Chu as their surname. During the Spring and Autumn Period, there was a doctor named Zi Chu in the State of Qi, and his descendants took their father's surname as their surname. According to legend, Chu was their surname.