Mrmić families are Croats and they are mostly from Petrinja. In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Petrinja. In Selišće Sunjsko in Hrvatska Kostajnica area every seventh inhabitant had the family name Mrmić.
Prevalence
About 80 people with faimily name Mrmić live in Croatia today, in 40 households. There were 150 of them in the middle of the past century, and their number halved. They are located in 10 Croatian counties, in 11 cities and 15 other places, mostly in Sisak (<10), Selisce Sunjsko in Hrvatska Kostajnica area (<10), Petrinja (<10), Varazdin (<10), and in Sibenik (<5).
Outside Croatia
Family name Mrmić (including: Mrmic , Mrmich ) is present in three countries on two continents. "Mrmich " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.