In Croatia, Košti families are Croats (from Mursko Sredisce area ). In the past century, relatively most of Croatian residents bearing this family name were born in Krizevci and in Beli Manastir area.
Prevalence
About 10 people with faimily name Košti live in Croatia today, in four households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Mali Poganac in Koprivnica area (<10), Banfi in Mursko Sredisce area (<5), Vrsar in Rovinj area (<5), and in Knezevo in Beli Manastir area (<5).
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.