Etymology and distribution of 小父内.

Obunai 【小父内】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Hokkaidou , Yamaguchi-ken , Niigata-ken . Saitama-ken birthplace of Kaso city. A place name with a record since the Edo period. The place name was also written as "addition". Saitama-ken Kazo-shi Kozojima 's Komyo Temple in Honcho said that Mr. Kazu built it in 1571 (original turtle 2 years). Kazu also has a story of "Kasu". It is unknown whether Kaishu will exist.