The original air-cooled VW Beetle was called the type 1 (1938 to 1979).
The van & pickup range was called the type 2 up to 1990. This included the split-window up to 1968, the bay-window up to 1980, then the brick from 1979 to 1990. The brick was air-cooled for the first few years and then was water-cooled, using a golf engine.
The type 3 used the basic beetle engine with a much-altered cooling system that meant the engine would fit under the floor of the saloon (Notchback), estate (Variant or Squareback) and the Fastback. This range ran from 1961 to 1973 and included the first mass-produced engine using electronic fuel injection
This next bit is complicated because VW called their largest air-cooled car the type 4, 1968 to 1974, and then re-used type 4 for the fourth generation commercial from 1991.
The type 4 car range was a 2-door saloon, a 4-door saloon and a 2-door Variant (Estate).
The whole car, engine, g/box, body, was completely new; the only range ran from 1969 to 1974.
VW marketing in USA was independent (model ranges & names coud be different) and produced some of the most brilliant car ads ever.
Happy days.
David