Sedmak families are Croats and they are mostly from Velika Gorica. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Velika Gorica. In Lukavec in Velika Gorica every seventh inhabitant had the family name Sedmak.
Prevalence
About 320 people with faimily name Sedmak live in Croatia today, in 130 households. There were 390 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 17 cities and 32 other places, mostly in Zagreb (95), Donja Lomnica (35), Lukavec (25), Djurdjevac (20), and in Velika Gorica (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.