Why do foreigners call Mercedes instead of Benz?

Actually, Mercedes-Daimler Company and Mercedes-Benz Company merged to produce cars, so they were called Mercedes-Benz. The main body of Mercedes-Benz Company is Mercedes-Daimler, which is called Mercedes because westerners, especially Germans, know better about it. However, we in China don't know these sources, only know that Ben Ci is the inventor of cycling, and Mercedes-Benz is easy to pronounce, so we like to call Mercedes-Benz Mercedes-Benz.