Etymology and distribution of 田ノ窪.

Tanokubo 【田ノ窪】^{レベル2
About 40}  The Japanese surnames etymology dictionary.

Okayama-ken Okayama-shi Kita-ku. There is a 中楯 surname. Okayama-ken Okayama-shi Kita Ward Kibitsu is headquartered. It was in the Edo period in the same place. 中楯 Nakadate reference.