Etymology and distribution of 蝶子.

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

Yamagata-ken Sakata-shi , Hokkaidou Sapporo-shi , Niigata-ken . Terrain . Yamagata-ken Sakata-shi I tell him that Mr. Sakai's vassal gave back to Mr. Honma who lives in the northernmost of the Mogami river flowing in the same place as he returned home, meaning "Mr. Honma in the south of Mogami River" . Estimated early in the Edo period. Yamagata-ken Yamagata-shi Kasagi-machi was in the Edo period in the clan of the Yamagata of the Clan office. 本間 Honma reference.