Etymology and distribution of 曽合.

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

Tochigi-ken Nasushiobara-shi . A variant of 津久井 . Tochigi-ken Nasushiobara-shi It was in Edo period in Hundred Villages. I will tell Fukushima - ken 's Aizu' s outfit at the same place. Mie-ken Iga-shi It was in the Edo era in the foreground. 津久井 Tsukui reference.