Etymology and distribution of オパラアク.

Oparaaku* 【オパラアク】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Yamaguchi-ken , Hiroshima-ken , Okayama-ken . Terrain . From one place. Okayama-ken Maniwa-shi Distributed in upper part . There is 片岡 surname in the same place. 片岡 Kataoka reference.