Not really a good counter example as "Jack Ma" is his English name (i.e. not his legal name, not the one printed on his passport. more like a nickname that can be easily remembered by westerners).

If you google his legal Chinese name, you will find that it's never "Yun Ma" in English media. Instead it's always "Ma Yun"...because he is a big shot.

That's because Jack is an English name he chose to be widely known by. If he had kept his given name as a primary form of address we'd probably see him colloquially referred to as "Ma" or "Ma Yun".