Kodrnja families are Croats and they are mostly from Klanjec area. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Klanjec area. In Brezakovec in Klanjec area every ninth inhabitant had the family name Kodrnja.
Prevalence
About 170 people with faimily name Kodrnja live in Croatia today, in 80 households. There were 210 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 14 cities and 21 other places, mostly in Zagreb (90), Rijeka (15), Zagorska Sela in Klanjec area (15), Bjelovar (<10), and in Zapresic (<10).
Outside Croatia
Family name Kodrnja is present in 9 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.