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I like Bluestar but the problem is what happens to the name in other languages. For example, in Japan to be blue sometimes has a connotation similar to greenhorn (You're new at it so please make allowances for not being very good). So while not very imaginative, the letter or letter-number combination has the least language implications. Of course, you don't want 4219 as a model name either.
LOL! Jerry, you must speak Japanese. (for those that don't, "4219" spelled out in Japanese can also mean "I go to die" - truly an inauspicious name for a car)