Original: It is believed that the name "butterfly" originated from a member of this family â "the Brimstone Gonepteryx rhamni â" which was called the "butter-coloured fly" by early British naturalists.
Simplified: It is believed that the name "butterfly" originated from a member of this family, the Brimstone Gonepteryx rhamni. It was called the "butter-coloured fly" by early British naturalists.