Hey Izmina! We actually have some info about this from ARR. The predominant tribe that has made their home in the Sagolii Desert is the Drake tribe, which is represented by the letter "U". However, as there are many Seeker of the Sun Miqo'te who wander the desert and eventually wind up in camps around Thanalan and sometimes Ul'dah, you can feel free to have your tribe origins come from anywhere really. But as was already mentioned in this thread, the predominant homes for the tribes are La Noscea and the Sagolii Desert. This does not mean however that Miqo'te from these tribes don't frequently travel outside of these areas.
