Etymology and distribution of 孝学.

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

Hiroshima-ken , Yamaguchi-ken , Fukuoka-ken . There was a name of Masuda Sadako in the warrior who used Shimane-ken western part (formerly Iwami-kuni) as a ground for the warring States period. Hiroshima-ken Mihara-shi was in the Edo period. 益田 Masuda reference.