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.
The most common first name in the world is Maria, and the most common last name in the world is Wang. Erfo the most common name in the world is Maria Wang.