Emperor Yūryaku
Mount Miwa was first described in the Kojiki as Mount Mimoro (). Both names were in common use until the reign of Emperor Yūryaku, after which was preferred. has been held to mean something like "august, beautiful" () and "room", or "hall" ( corruption of ). The current kanji () and () are purely phonetic. It has also been written , another a phonetic spelling with the same pronunciation.