Don't you think it would be good to group all Corvettes together? I see some listed as their own make and some as a model under Chevrolet. AFAIK, they're all Chevy Corvettes.
http://www.gm.ca/gm/english/vehicles/chevrolet/corvette/overview?adv=86666&k_cli- ckid=14480179-8e9b-56a9-eb8a-000029c8b5d0

In Europe for the C6 they were not sold as Chevrolet, since they used that make for rebadging Daewoo cars.
You could not find the Corvette on the Chevrolet websites of EU states, and there is a separate site for these: http://www.corvette-europe.com/
But now that seems to change, for 2011 they reintegrate it in the Chevrolet model line...