The task in the TV series The Secret History of Xiaozhuang is about sourdrang dowager in the Qing Dynasty. It's not Manchu's name, but Han's name. Manchu's surname and first name are very different from those of Han nationality. You can hear that the name of Manchu is long and circuitous, but the Qing army just moved into the Central Plains not long ago. At that time, Xiaozhuang was not in the Central Plains, but also on the grassland, so it was impossible to name the Han nationality Da Yuer.
Xiaozhuang's name should not be Da Yuer. According to unofficial history's book below, neither the Secret History of the Thirteen Dynasties of the Qing Dynasty nor the Romance of the Qing Dynasty called her Zhuang Fei, but called her Yu Fei, which may make people misunderstand. Jade refers to the special beauty of Xiaozhuang, and its skin is as smooth and white as jade, so it is called Yu Fei, so the general screenwriter may have invented "Fei Da" for Xiaozhuang according to Yu Fei in unofficial history.
According to historical records, Xiaozhuang, whose real name is Bumubutai, is the youngest daughter of Berzigit Bellezasang in Horqin Grassland, Mongolia. Because Mongolia was a powerful help to the Qing dynasty at that time, most of the Manchu royal families married Mongolian women, and Xiaozhuang married Huang Taiji, who later acceded to the throne and named Xiaozhuang Zhuang Fei. Zhuang Fei is very virtuous and has a special political mind. She often helped Huang Taiji to deal with big and small things in the DPRK, and even persuaded Hong Chengchou of the Ming Dynasty to submit to the Qing Dynasty. She has made great contributions, and Huang Taiji loves him very much.
"Xiaozhuang" was also sealed by Kangxi after her death, so we know where Xiaozhuang's name "Da Yuer" came from. As an ancient woman, she was successful.