Etymology and distribution of 関久.

Sekihisa 【関久】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Gifu-ken · Aichi-ken . Thing . In Aichi-ken Kiyosu-shi , tell us that using the letter of "告" to Tsui at the time of Meiji New Family Name with Tsui Surname since the Warring States Period added "Well". 柘植 Tsuge reference.