Etymology and distribution of 沖奈.

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

Ibaraki-ken .

① Originated from the vicinity of Aichi-ken Ama-shi (formerly Haito County). A place name with a record since the Heian period. Ibaraki-ken Tsuchiura-shi Central was in the Edo period in the Tsuchiura clan of the clan government.

② Kumamoto-ken Originated from the east of the east, west, north and south of Ogawamachi of Uki-shi . A place name with a record since the Kamakura period. The place name was also written as "sea head". Tradition in Shimane-ken western part (formerly Iwami-kuni).