Etymology and distribution of 合阪.

Aisaka 【合阪】^{レベル3
About 50}  The Japanese surnames etymology dictionary.

Ooita-ken . Shizuoka-ken Suntou-gun Oyama-chou Originated from Takeno -kota (formerly Shosai ). A place name with a record since the Kamakura period. The place name was also written as "Ayizawa", "Aizawa", "Tensei", "Aizawa." Last name was also written as "Aizawa." I met Ooita-ken as a vassal of Mr. Otomo who used it as a base in the Kamakura period and the Muromachi period.