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I doubt that 300m English-speaking Americans know what a gyro is.  But I would guess that you're right that the name ""gyros"" is more common in the US than ""doner"" or ""shawarma"".  However, though this is an English-language Wikipedia, it is not a US Wikipedia. And I think it would be more contentious to unify under gyro or shawarma than doner kebab.  "