Etymology and distribution of 古坂.

Kosaka 【古坂】^{レベル4
About 1,100}  The Japanese surnames etymology dictionary.

Iwate-ken Iwate-gun Kuzumaki-machi , Iwate-ken Morioka-shi , Kagoshima-ken Ooshima-gun Tokunoshima-chou .

① Topography . From village and sawa. Iwate - ken Iwate - gun Kuzumaki - machi is based in Kuzumaki.

※ Ishikawa-ken Kanazawa-shi Marunouchi was in the Edo period in the Kaga clan in the Clan office.

② Topography . "Sawa" was added to the village which is the surname of the Kamoshima-ken Amami archipelago. Estimated at the time of returning to Japan in 1953. 里 Sato reference.

Furusaka 【古坂】^{レベル4
About 1,100}  The Japanese surnames etymology dictionary.

Shimane-ken , Aichi-ken , Hokkaidou . There is 矢沢 surname. Shimane-ken Nita-gun Okuizumo-chou Yatsushiro is based.

※ Saga-ken Kashima-shi Tsukihiro / Takatsuhara was in the Edo period in the Kashima clan of the clan office.