You know, people get mad when there’re some kind of changes with names. Do it right since the beggining and nobody will be upset.
Edit: I don’t really think that they will be a full civ. Just in case if they appears as a minor civ, unit, map description, campaign or whatever.
Edit II: Jesus, I forgot to explain why they should be called Amazighs and not Berbers, the whole point of this topic. Berber comes from Barbarian. Amazighs have been asking to be called as Amazighs to ditch that name.