Etymology and distribution of 永窪.

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

Okayama-ken Kasaoka-shi . Personal name . Okayama-ken Kasaoka-shi In Nishio Oshima tells that it is a descendant of the ordinary life . Ka sum general of warlord of the Heian period had another name for the flat daily life. It is based in the same place. 平 Taira reference. 上総 Kazusa reference.

※ There is also a story that in the same place he was Genji at the descendant of Emperor Seiwa who lived from the Warring States Period and is the Emperor of the Heian period. 源 Minamoto reference.