In Croatia, Kolert families are predominantly Croats (from Orahovica ), rarely Czechs (from Daruvar area ). In the past century, relatively most of Croatian residents bearing this family name were born in Orahovica and Pakrac.
Prevalence
About 30 people with faimily name Kolert live in Croatia today, in 12 households. There were 20 of them in the middle of the past century, and their number increased by 60 percent. They are located and 6 other Croatian places, mostly in Sesvete (<10), Orahovica (<10), Cacinci in Orahovica area (<5), Kutina (<5), and in Slatina (<5).