Smrkulj families are Croats and they are mostly from Pregrada. In the past century, relatively most of Croatian residents bearing this family name were born in Pregrada and Zagreb.
Prevalence
About 70 people with faimily name Smrkulj live in Croatia today, in 30 households. There were 50 of them in the middle of the past century, and their number increased by 40 percent. They are located in threee Croatian counties and 12 other places, mostly in Benkovo (30), Zagreb (15), Donji Desinec (<10), Vrhi Pregradski (<10), and in Zapresic (<5).
Outside Croatia
Family name Smrkulj 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.