Kosalec 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 Zlatar.
Prevalence
About 140 people with faimily name Kosalec live in Croatia today, in 60 households. There were 120 of them in the middle of the past century, and their number increased by 10 percent. They are located in 9 Croatian counties, in 10 cities and 23 other places, mostly in Zagreb (45), Cakovec (15), Zlatar-Bistrica in Oroslavje area (10), Trnovec in Varazdin area (<10), and in Belec (<10).
Outside Croatia
Family name Kosalec is present in two countries on two continents. The family name "Kosalec " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.