Etymology and distribution of 井久.

Ikyuu 【井久】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Nagasaki-ken Sasebo-shi · Saitama-ken . 鯨伏 variant. Nagasaki - ken Sasebo - shi In Shimonobu - cho, there is a transmission that engaged in whaling and changed from Nakazato 's surname at the end of the Edo period. 中里 Nakazato reference.