Topčagić families are mainly Croats and they are mostly from Cazinska Krajina Region (Bosnia), often Bosniaks (also from Cazinska Krajina Region , Bosnia). In the past century, relatively most of Croatian residents bearing this family name were born in Cazins Region, Bosnia (Velika Kladusa area) and in Cazins Region, Bosnia (Cazin area). In Šturlićka Platnica in Cazins Region (Bosnia) every fifth inhabitant had the family name Topčagić.
Prevalence
About 90 people with faimily name Topčagić live in Croatia today, in 40 households. They are located in 10 Croatian counties, in 15 cities and 16 other places, mostly in Zagreb (10), Pula (10), Labin (10), Lucko (<10), and in Viskovici in Labin area (<10).
Outside Croatia
Family name Topčagić is present in 12 countries on four continents. The family name "Topcagic " is used by some 70 people in the United States , small number in Sweden , and small number of people in Germany.
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.