Etymology and distribution of 岩逧.

Iwasako 【岩逧】^{レベル3
About 60}  The Japanese surnames etymology dictionary.

Nagano-ken Chino-shi . 牛山 surname. Nagano-ken Nagano-shi We tell from the word "drawn by a cow and visiting Zenkoji" about Zenkoji in a unitary state in Motomu-cho. Period, location unknown. 牛山 Ushiyama reference.