Family name Iaser (Ясер 
, Iaser 
) , in the world, is a very rare cognomen. The family name Iaser is habitual in Belarus, where it is a rare surname, Kyrgyzstan, where it is a very rare surname, and Ukraine. In absolute terms, this name is the most popular in Eastern Europe, particularly Belarus, Ukraine, and Russia. More frequently, Iaser is the forename as well as the last name.