Drlja families are Croats and they are mostly from middle Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Kakanj area) and in Middle Bosnia (Zenica area).
Prevalence
About 110 people with faimily name Drlja live in Croatia today, in 40 households. They are located in the most of Croatian counties, in 17 cities and 17 other places, mostly in Gracac in Knin area (30), Rijeka (10), Brtonigla in Buje area (<10), Knin (<10), and in Split (<10).
Outside Croatia
At least three families with this surname emigrated from Croatia to: the United States (1), Austria (1), and to Germany (1). Family name Drlja is present in five countries on four continents. The family name "Drlja " is used by few people 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.