On the automotive front, abbreviations only:
‘Jeep’ comes from WWII U.S. Army terminology: general purpose vehicle.
AC spark plugs are named for Albert Champion, the same fellow after whom Champion spark plugs are named.
The MG car brand derives from Morris Garages.
SU carburetors (given their British origin, I suppose that should be carburettors) are from Skinner’s Union.
Saab: Svenska Aeroplan Aktiebolaget.
Fiat: Fabrica Italiana Automobili Torini.
Daf: van Doorne Aanhangwagen Fabriek.
MAN: Maschinenwerke Augsburg Neuburg.
Alfa Romeo: Anonima Lombarda Fabbrica Automobili. Businessman Nicola Romeo bought the company soon after its creation.
Iveco: I don’t have this one exactly, but it’s something like Industrial Vehicle Company in Italian.
DKW: Abbreviation of Dampfkraftwagen, German for ‘steam motor car.’ It has also been interpreted as ‘Das kleine Wunder’ (the little wonder).
REO: Ransom Eli Olds (as in Oldsmobile).
Simca: Société Industrielle de Mécanique et Carrosserie Automobile.
VAZ: Volzjskij Avtomolbilnij Zavod.
Volvo: ‘I roll’ in Latin.
ZIL: Zavod Imiena Likhachov.
Trabant: German for footman or satellite; the car honors (!) the Sputnik satellite.