Family name Katsar (Katsar 
, Кацар 
) , throughout the world, is a rare last name. The cognomen Katsar is habitual in Belarus, where it is a rare surname, Algeria, and Morocco, where it is a very rare surname. Measured by absolute frequency, the name is most common in Russia, Algeria, and Belarus. Very seldom, Katsar is the forename as well as the last name.