In Croatia, Pilaj families are almost entirely Croats (from Cakovec area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec area and in Cakovec.
Prevalence
About 30 people with faimily name Pilaj live in Croatia today, in 12 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in threee Croatian counties, threee cities and 5 other places, mostly in Gornji Mihaljevec (<10) and Dragoslavec Selo (<10) in Cakovec area, Motovun in Buzet area (<10), Porec (<5), and in Pula (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.