Etymology and distribution of 戸井口.

Toiguchi 【戸井口】^{レベル3
About 200}  The Japanese surnames etymology dictionary.

Ooita-ken Ooita-shi , Ooita-ken Beppu-shi . In Ooita-ken , I tell him that he changed his name "No" as "Miyako" because his first son died in the Tokyo era with Noiichi (Noiichi) surname in the Edo period. Pronunciation is not pronunciation. 能一 Nouichi reference.