Lešnjak 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 Oroslavje area and in Zagreb.
Prevalence
About 240 people with faimily name Lešnjak live in Croatia today, in 80 households. There were 170 of them in the middle of the past century, and their number increased by 40 percent. They are located in 10 Croatian counties, in 12 cities and 17 other places, mostly in Gornja Bistra in Oroslavje area (90), Zagreb (20), Cakovec (20), Donja Bistra in Oroslavje area (20), and in Vidovec in Varazdin area (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.