I certainly haven't seen sufficient evidence. But again, the name's origin is merely a footnote with regards to its current connotation.
Because that survey was poorly executed from a methods standpoint. It allowed for self-identification. That means anybody who heard a rumor that their great great grandma was half Cherokee could identify as Native American. Not exactly the most accurate method.
A more recent survey found that 67% of Native Americans find the term racist. This survey only people who could be verified to be Native American:
But people will keep trotting out that poorly executed, preaching it as if it were fact, without ever taking a moment to skim how the data was collected. Hey, anything to keep your team's name, right?