Last name رکس (Rex 
, Reks 
, رکس) , around the world, is a common surname. The surname رکس is habitual in Greenland, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Macao. In absolute terms, it is the most numerous in the United States, Nigeria, and Germany. More frequently, رکس is the forename as well as the last name.