Cognomen Xem (عم 
, Xem 
) , throughout the world, is quite a rare family name. The family name Xem is characteristic of Sudan, where it is quite a rare surname, Palestinian Territory, where it is a rare surname, and Libya. Not in comparison with a country's population, it is the most numerous in Sudan, Egypt, and Saudi Arabia. More prevalently, Xem is the forename as well as the last name.