Surname Ислен (الاثنين 
, Ислен) , all over the world, is a rare family name. The cognomen Ислен is habitual in Sudan, where it is a rare surname, Saudi Arabia, and Iraq, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Sudan, Egypt, and Saudi Arabia. Much less frequently, Ислен is the forename as well as the last name.