Why only Li Shimin's eldest son Li Chenggan's name is three words?

Of all the children in Li Shimin, why is only the eldest son named Li Chenggan, and his name is three words? There is no clear record in history, but according to historical events, several other older children in Li Shimin may have used three characters originally, but for some reasons, they have all changed their names. We will continue to talk about the specific situation.

As we all know, after the Xuanwu Gate incident, he killed his own brother Li's son and younger brother Li Yuanji. Li's sons are,,, etc. The sons of Li Yuanji and his younger brother Li Yuanji all have the right to inherit, and they are named Li, Li Chengprize and Li Chengdu respectively. , all have inheritance. Li Chenggan, the son of Li Shimin, also took this word. Therefore, it is estimated that Tang Gaozu gave their grandchildren the right of inheritance, including Li Shimin's son.

In fact, in addition to his grandson, there are many people who are closely related to Yuan, such as Li Yuanji,, and so on. , and Li Xuanba changed the word because of taboo, and Li Shimin later changed his name to because of fortune telling, saying that he could save the world and save the people. Therefore, it can be found that Li Yuan originally gave a substitute word to his children and grandchildren, but if there are special reasons, he can change his name. So, according to this situation, Li Shimin's children should also be called Li Cheng or something, but only they have one, and other estimates are similar, which are taboo.

Like in the Qing Dynasty, Kangxi's children were all called Yin or something, but when one of them became emperor, the emperor's name could not be used. So Li Shimin may have a similar idea, and wanted Li Chenggan to be emperor, so he changed the names of other children directly, but it was not Li Chenggan who became emperor later. Li Shimin also thought of this, so he changed all the other children into characters, so that no matter which child became emperor, the other brothers didn't have to change their names. It is also for this reason that the names of many royal descendants are the last two words.