Kosec families are Croats and they are mostly from Donja Stubica area. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Ludbreg.
Prevalence
About 370 people with faimily name Kosec live in Croatia today, in 140 households. There were 280 of them in the middle of the past century, and their number increased by 30 percent. They are located in the most of Croatian counties, in 21 cities and 45 other places, mostly in Trnovec in Varazdin area (55), Zagreb (55), Slani Potok in Donja Stubica area (40), Ludbreg (20), and in Gornja Stubica in Donja Stubica area (15).
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.