Meng Sen, a scholar of the Qing dynasty, agreed. On the other hand, he thought the name "Manchu" might stem from Li Manzhu (李滿住), the chieftain of the Jianzhou Jurchens.
Another scholar, Chang Shan, thinks Manju is a compound word. "Man" was from the word "mangga" (ᠮᠠᠩᡤᠠ) which means strong and "ju" (ᠵᡠ) means arrow. So Manju actually means "intrepid arrow".
There are other hypotheses, such as Fu Sinian's "etymology of Jianzhou"; Zhang Binglin's "etymology of Manshi"; Isamura Sanjiro's "etymology of Wuji and Mohe"; Sun Wenliang's "etymology of Manzhe"; "etymology of mangu(n) river" and so on.