Etymology and distribution of 古家一.

Kogeichi 【古家一】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Hyougo-ken , Nagasaki-ken Sasebo-shi .

① Originated from Shikata-cho of Hyougo-ken Kakogawa-shi . A place name with a record since the Kamakura period.

② Nagasaki-ken Kitamatsuura-gun Saza-chou Birth of Shikisaku. A place name with a record since the Edo period. It was in the Sengoku period in the same place. Last name was also written as "Koshi". It is unknown whether Koshida exists.