Etymology and distribution of 二堂.

Nidou 【二堂】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Wakayama-ken Tanabe-shi . Wakayama-ken Tanabe-shi Ryujin village Originated from the old Kokubo Valley of Yasui. Wakayama-ken Tanabe-shi Ryujin village Takahara base. Wakayama-ken Tanabe-shi It was in the Azuchi-Momoyama era in the vicinity of the east of Ryujin village (old: mountain land (Sanji)).

※ Kyouto-fu Kyouto-shi was in the Edo period. Kyouto-fu Kameoka-shi in the same place tells that he came from Atsu town around Azuchi-Momoyama period. The pronunciation is Kokubo.