Krupljan families are mainly Croats and they are mostly from Cazma area , often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Garesnica and Kutina. In Velika Bršljanica in Garesnica every ninth inhabitant had the family name Krupljan.
Prevalence
About 110 people with faimily name Krupljan live in Croatia today, in 40 households. There were 70 of them in the middle of the past century, and their number increased by 60 percent. They are located in 7 Croatian counties, in 8 cities and 19 other places, mostly in Veliki Pasijan (20), Kutina (15), Narta in Cazma area (15), Zagreb (<10), and in Mali Pasijan (<10).
Outside Croatia
Family name Krupljan is present in this form only in Croatia.
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.