In Croatia, Kujaj families are predominantly Albanians (from Rijeka ), rarely Croats (from Osijek ). In the past century, relatively most of Croatian residents bearing this family name were born in Serbia.
Prevalence
About 20 people with faimily name Kujaj live in Croatia today, in two households only. They are located in two Croatian cities only, in Rijeka (10) and Visnjevac (<5).
Outside Croatia
Family name Kujaj (including: Kulyay , Khujjaj , Kuyayy and Kuiai ) is present in 8 countries on two 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.