Ishioka 【石岡】5 The Japanese surnames etymology dictionary.
① Topography . From the place that draws springs and water. Nara - ken Gojou - shi In the Kurokubu of Nishi - Yoshino - machi I tell him that Izumi was used at the Meiji New Last Name due to the shop name of the fountain shop in the Edo period. Saitama-ken Hiki-gun Hatoyama-machi Izui was a place name with a record since the Edo period. Niigata-ken Niigata-shi is awesome.