The answer probably depends somewhat on which country you are talking about. To me, both 'motor', and even more so 'automobile' are both historic words. Companies that use those words in the name are probably mostly ones that had the name from many years ago, or want to have an 'old-fashioned' tone to their name. Most modern companies would now just use 'car', or 'vehicle'. Also - Ltd, which is an abbreviation for 'Limited' may need to be used carefully, as it can have legal ramifications. Again, that depends on the country. Here, you can only use the word 'Limited' ( or Ltd) if you are legally a Limited Liability Company.