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.
I would say Astro.
Okay fine, real answer. According to this, the most common female name in the world is Maria and the most common male name is Mohammed. You can also find a breakdown by continent and country, here.