Adam named butterflies butterflies. GEN 2:19-20; So out of the ground the Lord God formed every beast of the field and every bird of the heavens and brought them to the man to see what he would call...
The term 'Butterfly' is derived from the yellow brimstone butterfly of Europe, which was first seen in the 'butter' season (early spring). The original name of the butterfly was 'flutterby'.