Etymology and distribution of 土泉.

Doizumi 【土泉】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Hokkaidou , Akita-ken Nikaho-shi , Toukyou-to . Ishikawa-ken Northern area (formerly Noto County) is a place name with a record since the Nara period. There is an example using Noto's "Noh". 藤原 family name is present. Akita-ken Nikaho-shi Konoura is based. 藤原 Fujiwara reference.