Etymology and distribution of 渡井口.

Toiguchi 【渡井口】^{レベル3
About 60}  The Japanese surnames etymology dictionary.

Fukushima-ken Kitakata-shi . Fukushima-ken Kitakata-shi Tell him that he was renamed from Yamaguchi's surname in the warring States era at Kumakura- machi. 山口 Yamaguchi reference. There is also a story that the same place used the shop name of Satsuma shop. Estimated in the western part of Kagoshima-ken (formerly Satsuma) is the origin.