I agree that the names are actually rooted in ethno-linguistic groups rather than citizenship, but it's actually very easy to infer that someone calling himself Htun Myint Naing probably holds a Myanmar passport, and
citizenship is the most pertinent fact when you're doing business internationally, especially when you're from a pariah state.
Sure, you'd be hard pressed to guess the nationality of most people with standard Spanish and English names, and people can make a lot of wrong inferences about nationality because of migration, intermarriage (recently I've lived with Britons with very obviously Polish, Italian and Spanish-diaspora names respectively) or ethnic groups overlapping borders.
You'd also be wrong in thinking that Lo Ping Zhong was likely to be a citizen of China rather than Myanmar, but you'd still be more inclined to background check his company more than Stephen Law's.