typically the “correct” jargon is as follows
4x2 your standard 2 wheel drive car, just nobody talks this way
6x2 would be your basic skoolie, 6 wheels, duallie in back, again nobody talk this way, but technically we should
4x4 4 wheels all 4 driven, your typical F250 and a few small busses on same chassis
6x6 typically army trucks with 3 axles, all driven and all single wheels dual axles in Back
8x8 the only one of these I’ve seen is an Argo which is an amphibious vehicle, off road pretty good on land and while it floats and can move on water it is doggedly slow like 3 mph.
8x2. Now most motor coaches have trailing non, powered single wheel axles and powered duallies, although you could call them 8x4 I suppose
18 wheelers or Semis or are in reality 18x4 as both rear axles are driven
I could go on, this is fun