Etymology and distribution of 正法院.

Shouhouin 【正法院】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Iwate-ken Oushuu-shi . Summary . It stands for Date. Iwate - ken Oushuu - shi In Eagou tells you that you added "down" to "Taku" which briefly briefly wrote the Meiji new family name that tried to Date Date. 伊達 Date reference.