Etymology and distribution of 薄山.

Usuyama 【薄山】^{レベル3
About 50}  The Japanese surnames etymology dictionary.

Kagoshima-ken Shibushi-shi . Kagoshima-ken Shibushi -shi Originated from Shobushi- cho's Shoji Underwater field.

※ Tell him that the descendant of Mr. Kazusa called it. Location unknown. Estimated in the late Heian period. 上総 Kazusa reference.