Etymology and distribution of 七樂.

Naraku 【七樂】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Kanagawa-ken , Nagasaki-ken , Shizuoka-ken . A variant of 小木 . Kanagawa-ken Sagamihara-shi In Uemurama, Minami-ku tells that Ogi surname was a vassal of Hojo who is a person of the Kamakura period. The pronunciation in estimation is a kogi. 小木 Ogi reference. Gunma-ken Kiryuu-shi It is a kogi in Honcho. It is said that Mr. Igarashi came from Niigata-ken in the Sengoku period and renamed in the Edo period. 五十嵐 Igarashi reference.