Sinković families are usually Croats and they are mostly from Zabok. According to some sources they are from Gusakovca near Gornje Stubice, very rarely Italians from Buja. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Zabok. In Prosenik Začretski in Zabok every second inhabitant had the family name Sinković.
Prevalence
About 1200 people with faimily name Sinković live in Croatia today, in 500 households. There were 1300 of them in the middle of the past century, and their number decreased by 0 percent. They are located in almost all Croatian counties, in 43 cities and 145 other places, mostly in Zagreb (270), in Temovec (45) and Radakovo (45) in Zabok area, Prosenik Zacretski (45), and in Prelog (35).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1769 in source 18th Century Census.