In Croatia, Klapšić families are almost entirely Croats (from Pleternica ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Pleternica and Zagreb.
Prevalence
About 30 people with faimily name Klapšić live in Croatia today, in 12 households. There were 40 of them in the middle of the past century, and their number decreased by 40 percent. They are only located in in 6 Croatian cities and 5 other places, mostly in Zagreb (<10), Svilna (<10), Pozega (<10), Buk (<5), and in Sesvete (<5).
Outside Croatia
Family name Klapšić is present in this form only in Croatia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1943 in source Directorium ARCHI-DIOECESI ZAGREBIENSI.