Špernjak families are Croats and they are mostly from Ivanec area. In the past century, relatively most of Croatian residents bearing this family name were born in Ivanec area and in Koprivnica.
Prevalence
About 90 people with faimily name Špernjak live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number increased by 20 percent. They are located in 8 Croatian counties, in 7 cities and 13 other places, mostly in Koprivnica (20), Privlaka (10), Donja Voca in Ivanec area (<10), Ivanecki Vrhovec (<10), and in Fotez Breg in Ivanec area (<10).
Outside Croatia
Family name Špernjak (including: Spernjak , Spernyak ) is present in 6 countries on three continents. "Spernyak " is used by small number of 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.