Huh, the look doesn't appeal to me at all, but the sound is alright. GUY-mon or GEE-mon (like geese)? Hm. I don't mind either. But I feel like Guy is not a great nickname option, so you might have to fight that a bit. Or come up with something else. Geem might work. Guym is a bit weird. Maybe initials? Not that it needs a nickname, necessarily.
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589To peruse my non-name musings:
http://jodifriesen.blogspot.ca/