Kotlar families are Croats and they are mostly from Zadar. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and Dubrovnik.
Prevalence
About 220 people with faimily name Kotlar live in Croatia today, in 80 households. There were 210 of them in the middle of the past century, and their number remains constant. They are located in 8 Croatian counties, in 9 cities and four other places, mostly in Zadar (190), Mravinjac (10), Zagreb (<10), Karlovac (<10), and in Slavonski Brod (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.