Trlin families are Croats and they are mostly from north Herzegovina. According to some sources they are from Vrgorac area (zaselak Trlini). In the past century, relatively most of Croatian residents bearing this family name were born in North Herzegovina (Konjic area) and in Vrgorac. In Ravča in Vrgorac every fifth inhabitant had the family name Trlin.
Prevalence
About 150 people with faimily name Trlin live in Croatia today, in 60 households. There were 70 of them in the middle of the past century, and their number doubled. They are located in the most of Croatian counties, in 16 cities and 22 other places, mostly in Ravca (35), Zagreb (30), Vrgorac (15), Split (10), and in Rijeka (<10).
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.