Ioka 【井岡】5 The Japanese surnames etymology dictionary.
Hiroshima-ken , Ooita-ken , Fukushima-ken . 伊倉 family name. Ibaraki-ken Koga-shi Sakuramachi was in the Edo period in the Furukawa Samurai of the Clan Office. Fukushima-ken Tajima Town, Minamiaizu-gun In Kawashima Kawashima-hei tell her that he came from the Nagano-ken Kamiina-gun Minowa-machi in the Edo period and changed from Kobayashi surname. 小林 reference.