Etymology and distribution of 市原.

Ichihara 【市原】^{レベル6
About 30,400}  The Japanese surnames etymology dictionary.

Nara-ken , Akita-ken , Oosaka-fu .

① There is a surname of 井岡 . Nara-ken Nara-shi Yokoi, Tokushima-ken Mima-gun Tsurugi-chou Ishike Iku is based. Fukuoka-ken Fukuoka-shi Chuo-ku Castle interior was in the Edo era in the Fukuoka clan in the clan office. 井岡 Ioka reference.

② Akita-ken Yokote-shi birth from Inoka. A place name with a record since the Edo period. Last name was also written as "Inooka". It is unknown whether Inooka exists.

③ Iwate-ken Ichinoseki-shi Birthplace of Sekimi-cho (formerly Inoka). A place name with a record since the Warring States Period. It was in the Muromachi period in the same place.