Last name Ilen (Ila 
, Ilen 
, Илен 
) , all around the world, is a common surname. The cognomen Ilen is habitual in Papua New Guinea, where it is quite a common surname, Libya, where it is quite a rare surname, and Morocco. Not in comparison with a country's population, it is the most numerous in India, Indonesia, and Algeria. More frequently, Ilen is the forename as well as the last name.