Etymology and distribution of 石和.

Ishiwa 【石和】^{レベル4
About 1,300}  The Japanese surnames etymology dictionary.

Hyougo-ken Sumoto-shi . Hyougo-ken Sumoto-shi Distributed in Goshiki-cho Ayuhara Tower.

Isawa 【石和】^{レベル4
About 1,300}  The Japanese surnames etymology dictionary.

Aichi-ken , Aomori-ken , Hokkaidou . Isoya, distribution including isotani as well.

① There is a tradition from Shiga-ken 's place name located around Lake Biwa. Period, location unknown.

② Chiba-ken Ichihara-shi Origin of Isogaya (Isogaya). A place name with a record since the Edo period. The place name was also written as "Isoya".

③ In Gunma - ken tell her that it was Ishigami (Isonokami) last name. 石上 Ishigami reference.