This study aims to uncover the origins of the names Sakãliba and Ghuzz (or Aghzaz) and their semantic meanings in the Maghreb during a period spanning six full centuries of the medieval era. It does so by examining the historical origins of these two groups, which were newcomers to the region, from the beginning of their arrival in the Maghreb until the end of the sixth century AH/twelfth century CE. The study also sheds light on the extent to which political, social, economic, and military factors influenced the employment of the Sakãliba and Ghuzz communities in the Maghreb in various spheres of life, while identifying their roles, functions, and contributions. This is particularly significant given that most contemporary historical studies have merely reproduced lists of the names of Maghrebi human groups without investigating their ethnic origins, ethnonymic meanings, and civilizational roles. Such studies have also overlooked the importance of identifying the status of human communities and the names of their constituent groups during the medieval period, while underestimating the role of newly arrived populations in shaping various aspects of life in the Islamic Maghreb. Furthermore, insufficient attention has been given to the issue of the ethnic and onomastic continuity of human groups that appear in historical sources, such as the Sakãliba and Ghuzz groups.