In Croatia, Tršan families are Croats (from Klanjec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Klanjec area. In Zagorska Sela in Klanjec area every sixtieth inhabitant had the family name Tršan.
Prevalence
About 30 people with faimily name Tršan live in Croatia today, in 14 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Zagreb (35), Zagorska Sela in Klanjec area (<5), Rijeka (<5), and in Mokosica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.