In Croatia, Trumić families are Bosniaks by relative majority (from Labin area ), rarely Croats (from Vinkovci ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Brcko area) and in Labin. In Repino Brdo in Bosanian Posavina every seventh inhabitant had the family name Trumić.
Prevalence
About 30 people with faimily name Trumić 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 7 Croatian counties, in 6 cities and 6 other places, mostly in Zagreb (<10), Vrecari in Labin area (<10), Labin (<5), Strmac in Labin area (<5), and in Dalj in Vinkovci area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1924 in source Emigration Commission Zagreb.