Etymology and distribution of 岩破.

Iwasaku 【岩破】^{レベル2
About 40}  The Japanese surnames etymology dictionary.

Toyama-ken . Summary . Abbreviation for Ushidani. Toyama-ken Imizu-shi In Tohoku-ninomi-minami told me that it was Usibaya surname. Estimated at the time of the Meiji New surname. 牛谷 Ushitani reference.