I thought club was a loin steak, another name for strip, but it seems to be a cut similar
to the ribeye. I agree with Michael, they're called different things in different parts of the country, one reason meat is now supposed to be labeled as to what part of the animal it's from. Of course, a small butcher probably can do what he wants. Here's a link that discusses club as being similar (not the same) as rib.
Edited to say>>>>
However, I checked my Bruce Aidells "The Complete Meat Cookbook and he comments on confusing names, specifically Delmonico being either rib or loin. As for the club steak, under the heading of short loin (where T-bones come from) he states "A bone-in steak without any tenderloin attached goes by many different names: bone-in top loin, New York strip loin(that's what they are generally called here in my part of Florida), shell steak, strip steak, Delmonico steak, and club steak. Take the bone away and the top loin steak gets called everything but late for dinner. Depending on what part of the country you're from, it can be called a Kansas City steak, New York strip steak, boneless club steak, ambassador steak, veiny steak, or strip steak."
So that leaves you right back where you started, the butcher will call it whatever he likes, lol...but they don't seem to be the same thing in most cases.
http://www.culinarycafe.com/Meat_Dishes/Steak_Glossary.html