Double posting, wanna fight about it? 6:00 in the parking lot, be there.
Chamy is credited in Wachenroder's end credits as チャミ. This is the only official rendering I'm aware of of "Chamy" in katakana, but I certainly haven't checked the end credits and albums of every single game he's worked on.
I got rid of Chamy Ishikawa (石川チャミィ) as an artist, since I couldn't confirm that name ever being used and so I have no idea where GMCL got that from. Plus, as seen in my previous post, his real surname is apparently Ishi too.