* Wagon R: (Suzuki)
* Wartburg: (East German brand, no longer in production)
* Willys: (Jeep brand's early name, also referring to specific models)
* Wolksvagen: (While the full name doesn't start with W, the common abbreviation "VW" does.)
There aren't many *common* current car models that start with W. Most car manufacturers tend to avoid names beginning with W for marketing reasons (pronunciation, memorability, etc.).