Etymology and distribution of 貝賀.

Kaiga 【貝賀】^{レベル4
About 500}  The Japanese surnames etymology dictionary.

Kouchi-ken . In Kouchi - ken , Genji 's descendant, which was based on Yamanashi - ken (formerly Kai), came from Nara - ken and Kouchi - ken Kami - shi was in Kusumi Tosayamada - cho 1549 After the fall year of the year (18th year of astronomy) tell Kouchi-ken served Mr. Nagorobu Okabe, which was based on Heian, Kamakura and Muromachi era. 源 Minamoto reference. Kai is a place name with a record since the Asuka period. 藤原 family name is present. 藤原 Fujiwara reference.