Chouruuna. Chou=Butterfly + Ruuna=The Japanese pronounciation of Luna.
Why this? Because one: This Pokemon reminds me of the Queen Alexandra's Birdwing Butterfly as seen in the following link: [link] and in: [link] . But at the same time it reminds me of a more local species of moth named the Luna Moth: [link] . I'm not sure why this Pokemon reminded me of the Luna Moth, but it did, and that's how I came to that conclusion for a name.
I must say, I fell in love with its caterpillar form much earlier, but now... I am in absolutely, head over heels, infatuated with this Pokemon and its evolution line.