Etymology and distribution of 下大澤.

Shimooosawa 【下大澤】^{レベル2
About 30}  The Japanese surnames etymology dictionary.

Saga-ken Saga-shi . Korean type . "Mountain" added to Cao. There is a record of naturalization on Saga-ken Saga-shi on February 7, 1977. The real name is 曺. The notation of "Official Gazette" is "Cao".