Etymology and distribution of 相沼.

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

Kanagawa-ken , Ehime-ken , Toukyou-to .

① Toukyou-to Machida-shi Aihara-cho · Kanagawa-ken Sagamihara-shi Green area originated in Aihara. A place name with a record in the notation of "Awa Iihara" during the Warring States Period.

② Birth of Gifu-ken Gero-shi Kanayama cho Iwase (formerly Aihara). Place name with a record since the North / South morning era.

③ Origin of Kanagawa-ken (formerly Sagami). A place name with a record since the Asuka period. Nagano-ken Shimoina-gun Anan-chou In rich grass we tell from Sagami's "Phase" and Sugawara's " Sorakuro " origin. Miyagi-ken Shiroishi-shi Shirakawa Tsuda Suwada also has the same tradition. 菅原 Sugawara reference.