Fantasias are appearance-only, unfortunately. However, I think it'd be perfectly fine to have had your character take up an "alter ego" name. There could even be a story behind it you could play with. A former Nunh (if Seeker, which I'm assuming since you mentioned a tribe) that got defeated by a challenging Tia, and was embarrassed to the point that they left - or, on the flipside, a Tia who wanted to leave the tribe to start a splinter that never got off the ground. Or even just a tribesman who was more interested in urban life and took on the new name to better "fit in."
There's plenty of ways to work with it.
There's plenty of ways to work with it.
~