Guan Yu usually called himself Guan, but later he called himself a partial general and the Shouting Marquis of the Han Dynasty. During the Three Kingdoms period, many people liked to introduce themselves before fighting to show how powerful they were, which was also another way of showing respect for the opponent. The one we hear most often is Zhang Fei. Before starting a war, he must first say: "I am Zhang Yide from Yan". Coupled with his voice, the man on the other side had already lost half his momentum before the fight started. The one I still hear often is Zhao Yun. When Zhao Yun appears, he usually says: "I am Changshan Zhao Zilong". Zhao Yun is more of a self-introduction, because his voice is not as loud as Zhang Fei. Guan Yu usually calls himself Guan in front of everyone, for example, "Guan has said goodbye", but usually calls himself Guan. During the battle, I remember that at first he called himself a young general. In "The Romance of the Three Kingdoms", when Hua Xiong was killed by warming wine, he called himself a young general. At that time, Guan Yu was indeed a young general, and no one knew him. I only know that he is Liu Bei's subordinate. Later, when he was named a general, he called himself a partial general. Later, he was named Han Shouting Hou and called himself Han Shouting Hou. In fact, it can be seen from this that Guan Yu is a person with low self-esteem. Guan Yu is very proud, but at the same time he also has low self-esteem. He is afraid that others will look down on him, so he looks down on others first.
So I can also see some clues in terms of self-proclaiming. Guan Yu claimed that they were all his own official positions. In this way, when others hear it, they will know what Guan Yu is. Next, Guan Yu would not claim to be the leader of Guan Yun in Hedong, because Guan Yu had killed people in his hometown at that time. So he counts as a fugitive. Normally, he doesn't want others to know that he is a fugitive. After all, this was a major stain on his life. Moreover, Guan Yu's original name was not Yunchang. He used to be called Changsheng, but later he changed his name to Yunchang because of the murder. Of course, Guan Yu is actually a bit exaggerated in "The Romance of the Three Kingdoms". For example, the murder of Hua Xiong by warming wine was not actually done by him, but by Sun Jian. But Guan Yu's righteousness is still worthy of our respect.