Shimada 【島田】レベル6
About 165,700
The Japanese surnames etymology dictionary.
Nagano-ken , Hiroshima-ken , Aichi-ken . Terrain . From a stone-laden slender land and a river. In Suwa of Nagano-ken , Sone means "Shallow in the lake".
※ There is a tale that Mr. Sone's branch added "river". Period, location unknown. 曽根 reference.