No its not wrong References are provided One can find the kanji in the scrolls and documents of the Kuki family and within many many reference books here in Japan but very few in English Kanji Daijiten also list the kanji and also lists it as arcaic but not wrong The reference to the  demons comes from Hontai Yoshin Ryu which does not have any scrolls that back it up predating the ones found regarding the Kuki family and the correct writing of thier name Also the lineage that was posted on here was in fact the Hontai Yoshin Ryu lineage not the Kukishin Ryu lineage  If we mention Minaki den then we have to mention the rest Why should we clutter this page up and why should they not have their own Wiki pages This is supposed to be a general overview of Kukishin Ryu not on any of the branches