Iwabe 【岩部】5 The Japanese surnames etymology dictionary.
Chiba-ken Isumi-shi , Toukyou-to . 伊大知 a variant of 伊大知 . Chiba-ken Isumi-shi Misaki cho Nakitaki is based. It was in the Edo period in the same place. There is also a tale that the fish was offered in the same place. Unknown times. 伊大知 reference.