How come surname prove your point. China was ruled by Mongols and Manchus who speak non-Sino-Tibetan languages. I even read Chinese also have Persian origin words. everyone wasn't speaking Mandarin for 2500 years, still only 70% Chinese know Mandarin, 400 million can't speak Mandarin.
Mongol and Manchu use Chinese. Persian culture ruled you, never us. Mandarin is standardized chinese. LOL. You know nothing about CHinese history. Those who don't speak it, can read and write it. dialect is not a language. Dumbo. Chinese is the oldest continuous language, this is a fact, there is no dispute about it.