In Croatia, Mrzlić families are almost entirely Croats (from Labin area ), very rarely Italians (from Split ). In the past century, relatively most of Croatian residents bearing this family name were born in Labin and Pula. In Zagorje in Labin area every ninth inhabitant had the family name Mrzlić.
Prevalence
About 20 people with faimily name Mrzlić live in Croatia today, in 9 households. There were 50 of them in the middle of the past century, and their number decreased significantly. They are located in threee Croatian counties, threee cities and threee other places, mostly in Plomin in Labin area (15), in Lupoglav (<5) and Lesiscina (<5) in Buzet area, Labin (<5), and in Rijeka (<5).
Outside Croatia
Family name Mrzlić (including: Mrzlic , Merzlich and Merzlic ) is present in three countries on two continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1571 in source Catholic Church Parish Records.