The word "Nan Man" should have appeared after Qin Shihuang invaded Lingnan. At that time, Qin Shihuang's invasion of Yue was very smooth, but it was very difficult to invade Luo Yue. Three hundred thousand Qin Jun could not capture Luo Yue's army for a long time, so there was a record of "not disarming for three years". In the end, after Qin Shihuang built the Ling Canal in Xing 'an, Guilin, Luo Yue was captured and the logistics of grain and grass was guaranteed. This shows that Luoyue people are brave and good at fighting.
When two civilizations communicate, there will always be something new that the other civilization does not have. Therefore, a new word must be created to refer to this thing, which is also true in ancient Central Plains culture. Among new words and phrases, transliteration is the simplest and most commonly used. For example, in ancient times, there was a word "Hao Hao", which meant "a kind of rice". In fact, this pronunciation means "rice" in Zhuang language, which is exactly the same as the Chinese explanation.
Similarly, the pronunciation of "village" in Zhuang language is similar to that of "person". So the positive solution of "Naman" should be: "Southern tribes (villages)". In addition, after the Qin Dynasty, the word "Luo Yue" was rarely used, and it was replaced by "Nan Man". However, other Vietnamese words are irreplaceable. It can be seen that "Man" is a transliteration of Zhuang language.
Some scholars believe that the so-called "Naman" is the name of the "barbaric" Luoyue nationality in the south, but this is actually wrong. But why do these scholars come to these wrong conclusions? Because, for a long time, people in the Central Plains have been used to belittling ethnic minorities. In addition, due to Luo Yue's tenacious resistance to the Qin Empire, Luo Yue people were labeled as "barbaric" by the Central Plains people. Moreover, most of these scholars are Han Chinese and do not understand the language of Zhuang nationality. That's why there is a misunderstanding of the word "Naman".