Shimo 【下】5 The Japanese surnames etymology dictionary.
Aomori-ken , Hokkaidou . A variant of the 白土 . Aomori-ken Minamitsugaru-gun Inakadate-mura Sakamori, Toukyou-to Chiyoda-ku Chiyoda was in the Edo era as the shogunate of the Edo shogunate of the government agency. The shogunder tells that Fukushima-ken Iwaki-shi gave out renamed from the clay surname. 白土 reference. In Ibaraki-ken , it is Hakuto.