Etymology and distribution of 改原.

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

Akita-ken , Hokkaidou , Tottori-ken . There is a winning title for the man's name. Shiga-ken was in Warring States Period in Gamo-gun. In the same place tell Fujiwara's descendant. 藤原 Fujiwara reference.