Grilec families are Croats and they are mostly from Pregrada. In the past century, relatively most of Croatian residents bearing this family name were born in Pregrada and Zagreb.
Prevalence
About 250 people with faimily name Grilec live in Croatia today, in 90 households. There were 290 of them in the middle of the past century, and their number decreased by 10 percent. They are located in the most of Croatian counties, in 18 cities and 30 other places, mostly in Zagreb (60), Pregrada (30), Krizevci (20), Bregi Kostelski (20), and in Sesvete (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1938 in source Phone Book - Zagreb 1938.