The Japanese surnames etymology dictionary.
Gunma-ken Isesaki-shi , Gunma-ken Oota-shi . Gunma-ken Isesaki-shi Origin of Nishi - Small Coast town, Higashi-Kochi prefecture . In the Warring States Period, there is a place name with the notation of "Kogaura" recorded. Last name was also written as "Ko Fukata" during Warring States Period. It is unknown whether Kohoko will exist.