Summoning all of my automotive knowledge,,,,,,, I will get it straighten out, I hope.
Vaguely grouped:
"American"
-Ford, Mercury, Lincoln, Jaguar, Land Rover, Volvo, Mazda, Aston Martin
-GMC, Chevrolet, Buick, Pontiac, Oldsmobile, Saturn, Cadillac, Opel, Vauxhall, Saab, Hummer, Daewoo, Isuzu, Holden
-Chrysler, Mercedes-Benz, Plymouth, Dodge, Jeep, Smart, Maybach
-Panoz
"Japanese"
-Toyota, Lexus, Scion
-Renault, Nissan, Infiniti
-Honda, Acura
-Suburu (weakly affiliated with GM)
-Suzuki (strongly affiliated with GM)
-Mitsubishi (strongly affiliated with DCX)
"European"
-Ferrari, Fiat, Maserati
-Peugeot, Citroen
-Volkswagen, Lamborghini, Audi, Skoda, Bentley, Bugatti
-BMW, Rover Group, Mini, Rolls Royce
-Porsche (very strongly affiliated with VW)
-Lotus (affiliated with GM)
-Qvale, MG
"Korean"
-Hyundai, Kia (affiliated with GM)