Etymology and distribution of 草井.

Kusai 【草井】^{レベル3
About 200}  The Japanese surnames etymology dictionary.

小下 Koshita reference.

Soui 【草井】^{レベル3
About 200}  The Japanese surnames etymology dictionary.

Ibaraki-ken Kitaibaraki-shi , Fukushima-ken , Hyougo-ken . In Fukushima-ken , distribution including black spots is also included.

① things . Ibaraki-ken Kitaibaraki-shi Otsu-cho is based. It is said that the fishermen from the factory produced the fishing gear with iron. Estimated in the Edo period. Yamagata-ken Yonezawa-shi Marunouchi was in the Edo period in the clan of the Yonezawa clan in the clan office. First letter surname of Amagi archipelago of Kagoshima-ken .

② Abstract . Abbreviation for Irono. Tokushima - ken Myoudou - gun tells Sanagouchi - son that it abbreviated Iron - no 's name in the Edo period. 鉄野 Tetsuno reference.