The Japanese surnames etymology dictionary.
Niigata-ken Minamiuonuma-shi . Niigata-ken Minamiuonuma-shi Kimizawa is based. It was in the Edo period in the same place. In the same place, tell the story that Mr. Nitta's descendant went through countries and got out of Gunma-ken . Estimated in the Northern and Morning era. There is "rice field" in Nitta. 新田 reference.