Etymology and distribution of 工本.

Kumoto 【工本】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Fukushima-ken Fukushima-shi · Toukyou-to Nerima-ku . Summary . Synthesis of Oyamada and Takeda. Mr. Oyamada who was a vice president of Mr. Takeda tells that Toukyou-to Machida-shi called "Oyama" of Oyamada and "Takeshi of Takeda" at Kamiyamada in Shimoyamada (Oyamada) town. Tell Fukushima-ken Fukushima-shi the descendant of the vassal of Mr. Takeda who came from Yamanashi-ken . 小山田 Oyamada reference. 武田 Takeda reference.