Since it's more coupe-ish looking than I thought it would be for a R-R and since it's based on the Ghost, I think "Silver Wraith" would be rather apt. That way it's historically classy and sexy, exactly what R-R is trying to do with this car.
CORNICHE. No question. Corniche has all the cachet, Ghost line is still a new kid. "Ghost Coupe" sounds lame I think, I like when Rollers have their own names for each car, the "Coupe" word is getting tiring to hear so much now that everybody's even using it on 4-Doors, etc., anyway.