Etymology and distribution of 豊沼.

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

Kouchi-ken .

① Kouchi-ken Kouchi-shi Origin of Tosa mountain Hirose. A place name recorded with the notation of "Hirose" in the Azuchi-Momoyama period. It is based in the same place.

② Birth of Kimchi -ken Sukumo-shi off the coast of the island. A place name with a record since the Azuchi-Momoyama period. It is distributed in the same place.