Etymology and distribution of 円上.

Enjou 【円上】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Nagano-ken , Saitama-ken , Hokkaidou .

① variant of 小河原 . Niigata-ken Agano-shi Ogawara (Kogawara) was a place name with a record in the notation "Ogawara" in the Edo period.

② Topography . From the small river. Tell Nagano-ken Matsumoto-shi that it was a Nozawa surname. 野沢 Nozawa reference. Saitama - ken Saitama - shi Iwaki - ku tells that in Magomei it changed from Nagai surname to Meiji New surname. 永井 Nagai reference. Kagoshima-ken Soo-shi From the Ogawahara gate in the Otani Otani Otani town, which was in the Edo period.