In Croatia, Petrošanec families are almost entirely Croats (from Ludbreg ), barely Slovenes, and . In the past century, relatively most of Croatian residents bearing this family name were born in Ludbreg and Drnis.
Prevalence
About 60 people with faimily name Petrošanec live in Croatia today, in 20 households. There were 90 of them in the middle of the past century, and their number decreased by 30 percent. They are only located in in 8 Croatian cities and 7 other places, mostly in Ludbreg (15), Struga in Ludbreg area (<10), Varazdin (<10), Zagreb (<10), and in Djakovo (<10).
Outside Croatia
Family name Petrošanec is present in three countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1929 in source Emigration Commission Zagreb.