Etymology and distribution of 桒生.

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

Aichi-ken Toyohashi-shi . 坂上 surname. Aichi-ken Toyohashi-shi It was in the Edo period in the castle town. In the same told that he came from Tochigi-ken with Mr. Shingo during the North and South morning era. 神藤 Shindou reference.