The families of successive emperors worked at `Shoikyoku' (Department in charge of dealing with clothes for emperor), and the family name, `I' (井) and `Ino' (井野), which derived from `I' (井), were often seen in Ubuyama-mura Village, Minamioguni-machi, and Ichinomiya-machi of Kumamoto Prefecture today, and `I' (井) is associated with `I' (倭).
「尚衣奉御」が歴代皇帝の親族がその任に当たっていたことや、現在「井」及び「井」という氏から派生した「井野」という姓は九州熊本県の産山村・南小国町・一の宮町などに多く存在すること、また井は倭（ゐ）に通じる。