Duplančić families are Croats and they are mostly from Split. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Zagreb.
Prevalence
About 270 people with faimily name Duplančić live in Croatia today, in 140 households. There were 270 of them in the middle of the past century, and their number remains constant. They are only located in in 8 Croatian cities and 8 other places, mostly in Split (250), Zagreb (30), Opuzen (<10), Mravince (<10), and in Solin (<5).
Outside Croatia
Family name Duplančić is present in 9 countries worldwide.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.