From the article, seems like Native American is common. That kind of makes sense for the USA, as a lot of us have heard of a great great grand daddy who was from some tribe or another, but the stories turn out to either be anecdotal (not verifiable) or so diluted that it feels wrong to claim the connection.

Elizabeth Warren got into a bit of trouble on this. It isn’t an uncommon problem, and I can see people admitting to lying here (even if they think there is a bit of truth to the claim).