In Croatia, Lešnik families are generally Croats (from Bjelovar area ), barely Slovenes (from Zadar ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Bjelovar area.
Prevalence
About 40 people with faimily name Lešnik live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 6 Croatian counties, in 6 cities and 7 other places, mostly in Zagreb (20), Bjelovar (<10), Dominkovica in Bjelovar area (<10), Varazdin (<5), and in Veliko Trojstvo in Bjelovar area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over forty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.