Instead of renaming the indigenous tribe, I would do a more deep genetic study creating new inner factions culturally different, with different ethnicites inside them, but without losing a cultural-genetic connection.
A northern italian Fianna would never be the same of a scottish one.
An ugric Wendigo will never be the same as a northern american one and so on.
So, ''Wendigo'' and ''Uktena'' would be just the tribal totem name, and the name the other tribes use to refer to them, even sometimes in a derogative way (after all, wta's tragedy, is made up by feuds, breeding stock...