Sowa 【租和】2 The Japanese surnames etymology dictionary.
Toukyou-to , Shizuoka-ken Itou-shi . Personal name . Shizuoka-ken Itou-shi Meiji New surname by monk of Eosuin in Soto Secton in Kawana. In the same temple tells that he was called from Muromachi Period, together with Mr. Watanabe's descendant and Tsugu Watanabe (Watanabe Tsugaru) and Watanabe Ei (Watanabe · Nagaru) "Tsuga" and "Ei" together. 渡辺 reference.