Etymology and distribution of 澤亀.

Sawakame 【澤亀】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Saitama-ken Iruma-shi , Kagoshima-ken Amami-shi . Terrain . Add "Da" to net which is the surname of Amagi archipelago of Kagoshima-ken . Estimated at the time of returning to Japan in 1953. 純 Sumi reference.