Some people think that "Xia" is named after Xia Shui (Hanshui). In ancient books, "Hua" and "Xia" were regarded as the Central Plains, and the four sides were called "foreign soldiers". China and Xia used to be common, and these two words are synonyms. It is summer in China. China is also called midsummer.
For example, in Zuo Zhuan's Ten Years in Office, Confucius said: "Don't seek summer, don't mess with China." The "Hua" here is also "Xia". Confucius regarded "Xia" and "Hua" as synonyms.
From the compilation of Shangshu, China ancient books began to use "Hua" and "Xia" together, collectively referred to as "Huaxia".
Kong Ying Da, a scholar in the Tang Dynasty, Justice in the Spring and Autumn Period and Zuo Zhuan: "China has a big gift, so it is called Xia; The beauty of a badge is called brilliance. "That is to say, because China is a state of etiquette, it is called' Xia', which means elegance; People in China wear beautiful clothes and pretend to be "flashy". The word Huaxia is not only geographical, but also has a deeper cultural deposition value.