They called it Harvest Festival in previous games, which isnt tied to a specific religion or culture. Calling it Turkey day actually ties it to American Thanksgiving more IMO.They only called it Turkey Day because it's the Animal Crossing equivalent of the strictly North American Thanksgiving holiday. If they'd called it Thanksgiving then only so many people would want to participate. Same happened with Bunny Day - if they'd called it Easter then only some people would've wanted/been able to participate. And personally I think that the Turkey Day name is adorable.