Family name Iousef (Юсеф 
, Iousef 
) , in the world, is a rare last name. The last name Iousef is characteristic of Armenia, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Russia, Ukraine, and Belarus. Likewise, Iousef is the forename as well as the last name.