Ofc Mohammed is the most common name but thats a name common within the muslim community. I have noticed the name Sarah in every country, regardless of race or religion. Or it might be an abrahamic religion thing but thats most of the world atleast.
I suspect other Abrahamic names might make the cut.
India and China each have around 1.4 billion people (source). The next nearest country is the US with ~340 million. Which is a pretty major drop off. So, I would start by looking at common names in either China or India.
Or even common names in both India and China if there’s one
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The most common Indian names are Hindu names which are isolated in India. Similarly the most common names in China are isolated there. Hence my argument for Abrahamic religions.