Etymology and distribution of 楮藪.

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

Ishikawa-ken , Iwate-ken · Hokkaidou . Terrain . 坂下 's variant. Ishikawa-ken Kaga-shi Distributed in Hashidate-cho. 坂下 Sakashita reference.