How did the word butterfly come from? Why butter?

The etymology of 1 and butterfly comes from the old English butler, which consists of butter and fleoge.

There is a long-standing saying that because butterflies like to steal cream and milk, people call them butterflies, because they are elves with colorful wings and like to steal cream. The above legend is also reflected in milchdieb, one of the German names of butterflies, which is equivalent to milk-thief in English.

3. Another explanation is that butter refers to the color of butterflies. Fly originally refers to insects involved in flying, and the word butterfly may first guide a sulphur yellow (closer to cream color when wings are closed) butterfly after winter in Europe. The male butterfly's front wings are yellow, which brings a warm light when flying, so it is called a butter-colored fly. The word evolved gradually.