Little Red Corvette (or Carvette as posted above)
Silverado (it's a truck not a car! Lol)
Carlotta, if going for just "Car" sound, not an actual car
Carnival call her Carni
Carmen or Karmann Ghia (spell it with with a C)
Carrado (means Knight) femalize it make it Carrada
That's it, my thinker's broke!