Etymology and distribution of 一神.

Ichigami 【一神】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hyougo-ken , Oosaka-fu , Kyouto-fu .

① Originated from the vicinity of Okayama-ken Kume-gun Kumenan-chou (old: Inaoka Nansho · Inaoka Kita). A place name with a record since the Kamakura period. Meiji New surname by priest of Jodo sect because being the birthplace of the founder of Jodo sect. Same source.

② Topography . From rice and Oka. Ishikawa-ken Hakui-gun Shika-machi Tell him that he was engaged in agriculture at Tokuda. Estimated in the Edo period. Good neighbor . Tokushima-ken Itano-gun Kamiita-chou Distribution in the western rust.

③ Topography . "Oka" was added to the rice which is the surname of the Kamoshima-ken Amami archipelago. Estimated at the time of returning to Japan in 1953. Kagoshima-ken Ooshima-gun Isen-chou It is distributed in Izen. 稲 Ina reference.