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You can say that in Polish, i.e. title "Pan" (Mr) or "Pani" (Ms) with either first name, last name or both. So I think people from certain cultural/linguistic backgrounds may not find it unnatural.

This seems to be common in the Philippines, home to many call centers. Many Filipinos are also prone to overusing Sir, to the point that one person I worked with used to refer to my colleagues as Sir John, Sir Bob etc (and no, this was not tongue in cheek).

I'm from the Philippines. I can't say 'Mr. First Name' is common but I totally agree that 'Sir' is overused.

that's an option in Spanish.