Well, since you asked.
All clownfish except the maroon (but that may be fixed soon) are in the genus Amphiprion. The various clowns are all different species. Amphiprion ocellaris is often refered to as False Percula, Amphiprion percula are usually refered to as percula. Amphiprion melanopus is called a cinnamon clown while Amphiprion clarkii is a clark's clown or sometimes called sebae though Amphiprion sebae is not the same as A. clarkii. Common names can get confusing but ocellaris and percula are different species and you can have wild caught and tank raised versions of each. Percula come from Australia while ocellaris have a much wider distribution.
As for wild caught vs. captive bred fish. Always buy captive bred if available. They are healthier, less stressed, more likely to succeed in the home aquarium and do not cause further stress on the reefs. We already have to take a lot off of the reef because there is no other way to get them so let's tread as lightly as possible.