Etymology and distribution of 以首一.

Ishuichi 【以首一】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Shimane-ken Goutsu-shi , Yamaguchi-ken · Hyougo-ken . Good neighbor . Creation . Shimane-ken Goutsu-shi Land town is based. In the same town, tell the descendants of the fallen who lost and lived in the war of Heike gate in 935 (Shinghe 5 years) to 940 (Tiankei 3 years). There is a belief that the descendant of Heiwa era warrior, Heike gate, called Kumi (Kumyo) and made Hisashi "city" after his birth. Period, location unknown. There is a word of idiom. It is unknown whether Kumi will exist. 平 Taira reference.