Mrzlečki families are Croats and they are mostly from Krapina area. In the past century, relatively most of Croatian residents bearing this family name were born in Krapina area and in Krapina. In Lužani Zagorski in Krapina area every fifth inhabitant had the family name Mrzlečki.
Prevalence
About 120 people with faimily name Mrzlečki live in Croatia today, in 50 households. There were 120 of them in the middle of the past century, and their number remains constant. They are located in 7 Croatian counties and 18 other places, mostly in Luzani Zagorski in Krapina area (20), Zagreb (15), Krapina (10), Podgora Krapinska (10), and in Dolice (10).
Outside Croatia
Family name Mrzlečki 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 2007 in source Encyclopaedia of Croatian Surnames.