Grozaj families are Croats and they are mostly from Zabok area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area.
Prevalence
About 130 people with faimily name Grozaj live in Croatia today, in 60 households. There were 150 of them in the middle of the past century, and their number decreased by 10 percent. They are located in 8 Croatian counties, in 13 cities and 9 other places, mostly in Zagreb (50), Donja Pacetina in Zabok area (45), Oroslavje (<10), and in Veliko Trgovisce (<10) and Sveti Kriz Zacretje (<10) in Zabok area.
Outside Croatia
Family name Grozaj is present in 7 countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.