I think it just means communications went down in most places and broadcasts stopped before a common nationwide terminology came into use, so whatever the zombies were being called locally ended up being what survivors from that area called them. And of course a few people who isolated themselves early on would've invented their own names. Gotta call them something, right?
I remember 9/11 wasn't actually called 9/11 for almost a month afterward. Different news outlets were calling it the Attack on America, the New York/DC Terrorist Attacks, the September 11th Attacks, etc. Took them a while to settle on one label.
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