After the spread of various TV series, many people think that Bumu Butai’s nickname is "Dayu'er". In actual history, Bumbutai was never called this name at all.
In "The Secret History of the Thirteen Dynasties of the Qing Palace" and "The Romance of the Qing Dynasty", it is said that Concubine Zhuang was called Concubine Yu. It was said that her skin was like fat jade, so she was called Concubine Yu. Da Yu'er was just processed by the screenwriter based on these unofficial histories in order to enrich the plot. Therefore, there is no explanation why Bumbutai should be called "Dayu'er", because she has never been called "Dayu'er" at all.
The real name of Queen Xiaozhuang Wen is Borjijit, and her given name is Bumubutai.
Extended information:
Queen Xiaozhuang Wen, surnamed Borjigit, was named Bumubutai (also known as Benbutai, meaning "noble person descended from heaven"). The second daughter of Beileborzijit Buhe of the Horqin Tribe of Mongolia, the niece of Empress Xiaoduanwen, and the sister of Min Huigong and Concubine Yuan.
Born on the eighth day of February in the 41st year of Wanli in the Ming Dynasty; in the tenth year of Tianming's destiny, she married Huang Taiji, the eighth son of Nurhaci, who was in the Jin Dynasty; in the first year of Chongde, Huang Taiji became emperor in Shengjing and was granted the title She is the concubine of Yongfu Palace.
The emperor's ninth son Fulin (Emperor Shunzhi) was born in the third year of Chongde; in the eighth year of Chongde, Huang Taiji died, and Emperor Shunzhi ascended the throne. He was honored with his aunt, Queen Xiaoduanwen, in the two palaces, and was called the Queen Mother. In the eighth year of Shunzhi's reign, she was titled Empress Dowager Zhaosheng.
After Emperor Kangxi came to the throne, he was revered as the Empress Dowager. He died on December 25, the twenty-sixth year of Kangxi, at the age of seventy-five. He was buried in Zhaoxiling and given the posthumous title. Yongzheng and Qianlong received posthumous titles. , the final posthumous title was: Xiaozhuang Renxuanchengxiangongyi to Dechun Huiyi Tianqi Shengwen Queen.
She is a famous empress in Chinese history. She trained and assisted the two emperors Shunzhi and Kangxi throughout her life. She was an outstanding female politician in the early Qing Dynasty.
Baidu Encyclopedia-Queen Xiaozhuangwen