Things I can think of off the top of my head.....
Alfa Romeo (or Autobianchi)
Brava/Bravo (Fiat models) or Beta (Lancia model) or Boxer (as in 512 Ferrari)
Cizeta
Dino & (or De Tomaso - made in Italy although owned by an Argentine)
Enzo (or Espada a Lamborghini model)
Ferrari (Dino, Enzo's son died early, the 246 Dino is named after him) or Fiat
Ghilbi (a Maserati model)
H.....hmmmm?
Innocenti
Jalpa (a Lamborghini model)
K....
Lancia (or Lamborghini)
Maserati (or Modena - where Ferraris and De Tomasos are made) or Miura (Lamborghini's first MR car)
N.....
Pagani (and Zonda - good one for Z!!!) or Pininfarina

some designs!
Quattrovalvole (Ferrari's original 4V per cylinder engine) or Quattroporte (a Maserati model)
R.....
Scuderia
Ferrari(The official name of the Ferrari racing team meaning Ferrari stable in Italian)
Testarossa (a Ferrari model - means "redhead" in Italian after the red valve covers on the engine

)
Uracco (a Lamborghini model)
Vallelunga (a De Tomaso model) or Veyron (new Bugatti model)
W.....
X1/9 (a Fiat model)
Y10 (a Lancia model)
Zagato (another Italian design studio responsible for the Aston Martin Zagato and Alfa Romeo SZ)