Krušlin 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 Zagreb and in Krapina area.
Prevalence
About 190 people with faimily name Krušlin live in Croatia today, in 80 households. There were 230 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 13 cities and 19 other places, mostly in Zagreb (70), Pregrada (25), Osijek (15), Senkovec in Zapresic area (10), and in Prigorje in Krapina area (10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.