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 don't know about first names, but as for middle names, I've noticed a 75% chance your middle name will be James if you're a guy and Marie if you're a woman. I also attended school somewhere where, I kid you not, every shop owner and public service manager was named either John or Julie.
I'm surprised you don't see more FBI agents in Gotham. It's a cesspool of crime, you'd think at least one person would at least be raided by a swat team.
supposedly, the Feds at some point gave up on Gotham and said "fuck it, it's hopeless, let them keep to themselves, as long as they're not leaving we're good.