Butterflies in Spring

I wonder why butterflies are given such prosaic names. They are usually named after animals or birds, or even flowers. The Common Crow is seen everywhere now.

I caught this Dark Blue Tiger when he was feasting on the Buddleja.

Same fellow when he came back for more.

Common Jays , Lemons and Crimson Rose are seen flying high in my garden. I have not been successful in catching them in the camera.