Surname Иль (Il 
, Иль 
, Il') , in all the world, is a common last name. The surname Иль is habitual in Morocco, where it is quite a common surname, Algeria, where it is quite a rare surname, and Mauritius. Not in comparison with a country's population, it most frequently occurs in Morocco, Algeria, and China. Also, Иль is the forename as well as the last name.