Etymology and distribution of 下古場.

Shimokoba 【下古場】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Fukuoka-ken . Fukuoka-ken Kitakyuushuu-shi Kokura - Kita Ward Castle Tells that Mr. Kawakami gave Mr. Kawakami from the Kokura lord of the Clan office in the end of the Edo period. 川上 Kawakami reference.