What are the meanings of the titles Wei, Shu and Wu in the Three Kingdoms?

The Three Kingdoms can't be called Sun Caoliu, because ancient dynasties were never named after emperors. For example, the emperor of the Tang Dynasty was surnamed Li, but he was called Tang Dynasty, not Li Dynasty. The emperor of the Ming Dynasty was surnamed Zhu, but he was called Ming Dynasty, not Zhu Dynasty. By analogy, the Three Kingdoms can't be called Sun, but Sun. So, why is it called Wei Shuwu, and not another name? They are:

Cao Wei's "Wei" came from a place called "Wei County" occupied by Cao Cao. At that time, it was ruled by Yecheng, which was originally the seat of Yuan Shao's shogunate. After Cao Cao destroyed the remnants of Yuan, he occupied Yecheng, with Yecheng as the ruling center. Perhaps Cao Cao thought that the occupation of Yecheng was a great victory in his life, so he deliberately highlighted the status of Yecheng, and the political status of Wei County also improved accordingly. In a sense, Wei County is a blessed land for Cao Cao, so Cao Cao used "Wei" as his political password. Later, Emperor Xian of Han Dynasty appointed Cao Cao as Wei Gong and Wang Wei, all of which reflected Cao Cao's ideas. In the end, Cao Pi proclaimed himself emperor on behalf of Han Dynasty, and "Wei" naturally became the national title.

The word "Shu" was not originally the name of this country, but later generations replaced it with the word "Shu" for convenience of memory. Liu Bei, the founder of this country, is a descendant of the royal family of the Han Dynasty. After the demise of the Han Dynasty, Liu Bei naturally became a continuation of the Han Dynasty, so this country naturally continued to be called "Han", that is, "Han" after the Western Han Dynasty and the Eastern Han Dynasty. At that time, Liu Bei's regime was directly called Han, not Shu. In the TV series Romance of the Three Kingdoms, it is a serious mistake to write the word "Shu" directly on the banner of Liu Bei's army. Of course, Liu Bei's regime at that time was called "Shu", that is, Cao Wei and Dongwu. This is a way for them not to recognize another regime, but it does not affect Liu Bei's admission that he is a "Han" regime. Later, when the historian Chen Shou wrote The History of the Three Kingdoms, he named this country Shu to distinguish it from the Western Han Dynasty and the Eastern Han Dynasty. Since then, this regime has been called Shu Han to distinguish it from several "Han" regimes in history. However, we must remember that the original name of this regime is "Han", just a word, not "Shu Han", let alone "Shu".

Sun Wu's "Wu" comes from Wu County, the birthplace of their country, which is now Suzhou City, Jiangsu Province. When Sun Ce destroyed Jiangdong, Wuxian was his political center. Until later, Wuxian was always the seat of Sun Quan's shogunate. Therefore, the regime took this place as its country name and called it "Wu". As for "Sun Wu", it is called by later generations to be different from a series of "Wu" regimes in history. This regime was only called "Wu" in history, not "Sun Wu".