Etymology and distribution of 井學.

Igaku 【井學】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Fukuoka-ken , Kanagawa-ken , Gunma-ken .

① Niigata-ken Nagaoka-shi Origin of Ishiuchi. A place name with a record in the notation of "stone hit" in the Warring States Period. It is distributed in the same place. It was in the Edo period in Kanagawa-ken Odawara-shi .

② Hiroshima-ken Hiroshima-shi Saeki-ku Saeki-ku Itsukaichi Machi Daichi originated in the stone. A place name with a record since the Edo period.