Kulji families are Croats and they are mostly from Zlatar area. In the past century, relatively most of Croatian residents bearing this family name were born in Zlatar area and in Varazdin.
Prevalence
About 60 people with faimily name Kulji live in Croatia today, in 30 households. There were 80 of them in the middle of the past century, and their number decreased by 30 percent. They are located and 5 other Croatian places, mostly in Grtovec in Zlatar area (30), Zagreb (10), Sesvete (<10), Prigorec (<10), and in Labin (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.