Etymology and distribution of 桧岡.

Hinooka 【桧岡】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Aomori-ken Aomori-shi , Hokkaidou Hokuto-shi . Miyagi-ken Ishinomaki-shi Originated from Miwada (Minowada). A place name with a record since the Warring States Period. Last name was also written as "Miwada." 三輪田 Miwada reference. Aomori-ken Kuroishi-shi Inner town was in the Edo period in the Kuroishi samurai of the clan office.