Etymology and distribution of 古鐡.

Kotetsu 【古鐡】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Oosaka-fu Habikino-shi · Nara-ken . Oosaka-fu Habikino-shi Originated from Higashi Ogawa (aka Shinazu river) of Shimaizumi. Meiji New surname by monk of Mingpyo in Jodo Shin Buddhist temple. In the same temple tells that there was also the designation of "Shinazu Bridge" as the name of the bridge. Estimated in the Edo period.