Grozdek families are Croats and they are mostly from Lepoglava area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Lepoglava area. In Gora Veternička in Lepoglava area every tenth inhabitant had the family name Grozdek.
Prevalence
About 250 people with faimily name Grozdek live in Croatia today, in 90 households. There were 180 of them in the middle of the past century, and their number increased by 40 percent. They are located in 9 Croatian counties, in 12 cities and 34 other places, mostly in Zagreb (50), Gregurovec in Krapina area (20), Beli Manastir (20), Gora Veternicka in Lepoglava area (10), and in Dugo Selo (10).
Outside Croatia
Family name Grozdek is present in five countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.