In Croatia, Kuljaj families are Croats (from Velika Gorica ).
Prevalence
Only a few people with faimily name Kuljaj live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in three Croatian cities only: in Karlovac (<5), Busevec (<5), and in Zagreb (<5).
Outside Croatia
Family name Kuljaj (including: Kulyay , Kuliay ) is present in 10 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1929 in source Emigration Commission Zagreb.