Mačak families are podjednako Croats (the family name originates from Hrvatska Kostajnica area ) and Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Grubisno Polje and Zagreb. In Mala Jasenovača in Grubisno Polje every third inhabitant had the family name Mačak.
Prevalence
About 130 people with faimily name Mačak live in Croatia today, in 70 households. There were 260 of them in the middle of the past century, and their number halved. They are located in the most of Croatian counties, in 17 cities and 24 other places, mostly in Ostrovica in Benkovac area (20), Zagreb (10), Djakovo (<10), Grubisno Polje (<10), and in Bobovac in Hrvatska Kostajnica area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.