Koncul families are Croats and they are mostly from Bosnian Posavina. According to some sources they are from Neuma area (Grabovice), Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Derventa area) and in Dubrovnik.
Prevalence
About 90 people with faimily name Koncul live in Croatia today, in 40 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in 6 Croatian counties and 10 other places, mostly in Dubrovnik (35), Metkovic (25), Zagreb (15), Vinkovci (<10), and in Velika Gorica (<5).
Outside Croatia
Family name Koncul (including: Concul , Konzul ) is present in 9 countries on four continents. The family name "Koncul " is used by small number of people in the United States and small number in Italy. "Concul " is used by small number of people in Guatemala and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.