Oh hardly, using a sterotypical name is a very common comedic device. Tarquin and Julian are out-of-touch upper class people who probably go on illegal fox hunts, Karen gets unreasonably angry over petty things at low-level customer service people who can't argue back, Doris insists on driving at 25 mph in a 60 while her husband Bernard shouts at passing children for sport. Kevin is roughly the male equivalent of Karen, while Chad is a world-reknowned cad. Billy No Mates is famous for being alone, while Johnny Foreigner occasionally struggles with idioms.
Joe Public of course is usually well aware of this usage and doesn't actually think all people with these names are the sterotype they represent.