Etymology and distribution of 後北.

Ushirokita 【後北】^{レベル3
About 70}  The Japanese surnames etymology dictionary.

Kagoshima-ken Ooshima-gun Kikai-chou . Creation . "Many" was added to Sakae which is the surname of the Kamoshima-ken Amami archipelago. Estimated at the time of returning to Japan in 1953. 栄 Sakae reference.