Last name Хаммар (Hammar 
, Хаммар 
) , in the entire world, is quite a common cognomen. The cognomen Хаммар is characteristic of Sweden, where it is quite a common surname, Finland, where it is quite a rare surname, and Algeria. Measured by absolute frequency, it is commonest in Sweden, Algeria, and the United States. Very seldom, Хаммар is the forename as well as the last name.