Grgec families are Croats and they are mostly from Oroslavje area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Oroslavje area. In places Donja Bistra and Gornja Bistra in Oroslavje area every twentieth inhabitant had the family name Grgec.
About 440 people with faimily name Grgec live in Croatia today, in 180 households. There were 500 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 30 cities and 36 other places, mostly in Zagreb (135), Gornja Bistra in Oroslavje area (35), Ludbreg (35), Jakovlje in Zapresic area (35), and in Donja Bistra in Oroslavje area (35).