Etymology and distribution of 洪陳.

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

Shimane-ken Yasugi-shi , Tokushima-ken Awa-shi . Terrain . From village and water. Shimane-ken Yasugi-shi tells that Shimane-ken 's Oki Islands came out and Kuromi surname was in the Edo period. 黒見 Kuromi reference.