from where did it get its name?
It derives from the Old English "butorflēoge"
Butterfly
The "Oxford English Dictionary" derives the word straightforwardly from Old English "butorflēoge", butter-fly; similar names in Old Dutch and Old High German show that the name is ancient.
what is the scientific classification of a butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the order Lepidoptera, which also includes moths.
wiki:11646829
Butterfly [SEP] Etymology
The "Oxford English Dictionary" derives the word straightforwardly from Old English "butorflēoge", butter-fly; similar names in Old Dutch and Old High German show that the name is ancient. A possible source of the name is the bright yellow male of the brimstone ("Gonepteryx rhamni"); another is that butterflies were on the wing in meadows during the spring and summer butter season while the grass was growing.