In Croatia, Mravinec families are Croats (from Sisak ). In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Zupanja.
Prevalence
About 30 people with faimily name Mravinec live in Croatia today, in 15 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located and 5 other Croatian places, mostly in Veliko Svinjicko (10), Zupanja (<10), Popovaca in Kutina area (<10), Zagreb (<5), and in Rijeka (<5).
Outside Croatia
Family name Mravinec is present in five countries on two continents. The family name "Mravinec " is used by small number of people in Russian Federation and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1932 in source Emigration Commission Zagreb.