The Japanese surnames etymology dictionary.
Gunma-ken , Niigata-ken , Nagano-ken . A variant of the 倉科 . Gunma-ken Numata-shi In Shimogya-cho, tell Nagano-ken Chikuma-shi warehouse. Nagano-ken Matsumoto-shi Marunouchi was a clan clerk of the clan government, Chiba-ken Sakura-shi castle town was in the Edo era in the Sakura clan of the clan office.