Why is China called Zhongguo?
The Chinese word for China, Zhongguo, literally means 'central state or states' (there is no plural inflection in Chinese), giving rise to the poetic sobriquet “Middle Kingdom.” Thus, China is not the land of the Han or the empire of the Qin, but simply the country in the middle.
Before the Qing Dynasty (1644-1911), the Huaxia nationality named their motherland Zhongguo, and after that, it developed into a nation of various nationalities, and was then called Zhonghua Nation (known as Chinese Nation). ZhongdenotesChina and Hua is the Huaxia nationality for short.
The People's Republic of China (PRC) is a sovereign state in East Asia, bordering the East China Sea, Korea Bay, Yellow Sea, and South China Sea.
Shina (支那, pronounced [ɕiꜜna]) is a largely archaic Japanese name for China. The word was originally used neutrally in both the Chinese and Japanese languages, but came to be perceived as derogatory by the Chinese during the course of the Sino-Japanese Wars.
Marco Polo, the famous explorer who familiarized China to Europe in the 13th century CE, referred to the land as 'Cathay. In Mandarin Chinese, the country is known as 'Zhongguo' meaning "central state" or "middle empire".
Over the centuries, Zhongguo was at times used in diplomatic dispatches to foreign vassal states but the dynastic name was still the official one. The first time Zhongguo was used as the Chinese nation's official name was in the Sino-Russian Treaty of Nerchinsk of 1689.
Japan had possession of roughly 25% of China's enormous territory and more than a third of its entire population. Beyond its areas of direct control, Japan carried out bombing campaigns, looting, massacres and raids deep into Chinese territory.
The name “China” comes from the ancient Chinese Dynasty named “Qin” (秦) [B.C. 221-B.C. 206].
Historians say the Japanese called their country Yamato in its early history, and they began using Nippon around the seventh century. Nippon and Nihon are used interchangeably as the country's name.
The term “zhong guo” means, first, capital of the state; second, the territory where the Han nationality lived and their state. At that time, the Han nationality mainly lived in the area of the middle reaches of the Yellow River.
What did ancient China call itself?
In fact, because they believed they were in the middle of the world, surrounded by natural barriers on all sides, the Chinese thought of themselves as "Zhong Guo" — the Middle Kingdom.
笑柄 xiào bǐng. a matter for ridicule an object of ridicule laughingstock.

The name Xiao Hong is primarily a female name of Chinese origin that means Morning Rainbow.
小名 xiǎo míng. pet name for a child childhood name.
Shang dynasty (1600–1046 BC)
The short answer is: yes, the Romans knew of the existence of China. They called it Serica, meaning 'the land of silk', or Sinae, meaning 'the land of the Sin (or Qin)' (after the first dynasty of the Chinese empire, the Qin Dynasty). The Chinese themselves were called Seres.
The country's name is derived from the title of China's first emperor, Qin Shihuang. Qin Shihuang, the First Emperor of China, was the first to unite the country.