Some consider Ibn Khaldun, a 14th century Arab Islamic scholar from North Africa, to have been the first sociologist; his Muqaddimah was perhaps the first work to advance social-scientific reasoning on social cohesion and social conflict.The word sociology (or "sociologie") is derived from both Latin and Greek origins.. 
population or Demography is the study of population number, composition, change, and quality as they influence the economic, political, and social system. 