What great suggestions on here. So inventive.
How about Peanut? After one of my favorite treats Reeses peanut butter cups. Mmmmmm. Plus, Peanut makes a great name for a big dog....lol
Or York (peppemint patty). Oh Henry? Clark (bar)? S'more? Keebler?
Here's a few lesser known chocolate candy names:
Uno
Chunky (maybe not the BEST name, but would be funny)
Goober
Idaho Spud
Ice Cube
Reisen
Toffifay
Whatchamacalli t (again funny, but a bit of a mouthful)
Zero
Aero
Chewy
Rolo
Scharffen Berger
Giannois
I've met several rabbits named Cadbury, but I think it would make a great dog name. I also liked the suggestion of Wonka, very cute.