Etymology and distribution of 小谷川.

Kotanigawa 【小谷川】^{レベル3
About 300}  The Japanese surnames etymology dictionary.

Toyama-ken Imizu-shi , Toyama-ken Takaoka-shi .

① Toyama-ken Takaoka-shi Trike (Sangha) was a place name with a record since the Edo period.

② Oosaka-fu Daitou-shi Mika's birth. A place name with a record since the Kamakura period. Last name was also written as "Three Ke". 三ケ Sanka reference. Nara-ken Gojou-shi In Imai-machi tells you that you changed your name from Fujiwara surname. 藤原 Fujiwara reference.

Kotanikawa 【小谷川】^{レベル3
About 300}  The Japanese surnames etymology dictionary.

Toyama-ken Oyabe-shi . A variant of 三箇 . There is a "river" consisting of a sansei bias and permission. 三箇 Sanga reference.