Family name Iassin (Iassin 
, Яссин 
) , in the entire world, is a very rare last name. The cognomen Iassin is characteristic of Belarus, where it is a rare surname, Georgia, where it is a very rare surname, and Spain. Measured by absolute frequency, it is the most numerous in Russia, Belarus, and Brazil. Likewise, Iassin is the forename as well as the last name.