In Croatia, Klaj families are Croats by relative majority (from Umag ), equally Italians (from Buje area ), and very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Umag and Buje.
Prevalence
About 30 people with faimily name Klaj live in Croatia today, in 8 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only four naselja i to in Umag (10), Fiorini in Buje area (<10), Petrovija (<5), and in Brtonigla in Buje area (<5).
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.