Etymology and distribution of 億.

Oku 【億】^{レベル3
About 90}  The Japanese surnames etymology dictionary.

Hokkaidou , Niigata-ken .

① Ainu system . Hokkaidou Hidakashi-chou Biratori-chou Originated from Nibutani's Pipa Rushi . In the Edo period there was a place name recorded with the notation of "Viva". The Ainu language pipa (pipa-us-i) means "crow shellfish / many places".

② Akita-ken Ogachi-gun Ugo-machi birth of Kaizawa. A place name with a record since the Edo period. There is a record in Heian period at Iwate-ken .