Starting with C:
* Chevrolet: A very large and well-known brand. Many models start with other letters, though.
* Chrysler: Another major brand with numerous models.
* Citroen: A French brand.
* Cadillac: A luxury brand from General Motors.
* Capri: A Ford model (though this is older and not currently produced).
* Corvette: A famous Chevrolet sports car.
Starting with K:
* Kia: A major South Korean brand.
* KTM (KTM Sportmotorcycle AG): While primarily known for motorcycles, they also produce some automobiles.
This is not an exhaustive list, as there are many other less common brands and models that begin with these letters, both past and present.
