EDIT: I've since changed my deer's name from Corvi to Igex, ever since I discovered his 'true name'. It was surprisingly easy to find. Just look in-game under Network, and it's right beneath the Log In.
Igex got his old Halloween-fawn pelt back! Yay! Now all he needs are the crow mask and ibex horns and he'll be his old self again.
(Igex the one with the secretary bird pelt, the gray one with the red spots and black stripes.)