Vizjak families are Croats and they are mostly from Ivanec. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Ivanec. In Željeznica in Ivanec every eighth inhabitant had the family name Vizjak.
Prevalence
About 130 people with faimily name Vizjak live in Croatia today, in 50 households. There were 100 of them in the middle of the past century, and their number increased by 30 percent. They are located in 9 Croatian counties, in 9 cities and 19 other places, mostly in Zeljeznica (25), Zagreb (20), Novska (20), Rijeka (<10), and in Varazdin (<10).
Outside Croatia
Family name Vizjak (including: Viziack , Vizyak ) is present in 13 countries worldwide. "Vizyak " is used by small number of people in the United States and small number in Ukraine.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.