Exceptions to the nomenclature of ending names with an "a" include the under-licence built Monterey, the Speedster (also known as the Vauxhall VX220 in Great Britain), GT (which was not sold at all as a Vauxhall, despite the VX Lightning concept), the Signum, Karl, and the Adam. The Adam was initially supposed to be called, "Junior" as was its developmental codename and because the name 'Adam' had no history/importance to the Vauxhall marque.
It had some crazy mechanical issues. At one point it stumbled and stalled because the carburetor had come loose from the intake manifold and I had to tighten it back down! Another time, my brother was driving it and the brakes failed. Somehow the end of the brake shoe that meets the brake cylinder piston had become worn on one side, causing the piston to slip off the end of the shoe when the brakes were applied, losing braking and squirting fluid all over.