Hlaj families are Croats and they are mostly from Buzet. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Karlovac. In Sušići in Buzet nearly every inhabitant had the family name Hlaj.
Prevalence
About 80 people with faimily name Hlaj live in Croatia today, in 40 households. There were 140 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 6 Croatian counties, in 9 cities and 5 other places, mostly in Sisljavic (30), Rijeka (10), Tvrdjavica (10), Zapresic (<10), and in Marinici in Rijeka area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1924 in source Emigration Commission Zagreb.