Only a few people with faimily name Petrovic live in Croatia today, in one household only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in three Croatian cities only: in Zagreb (<5), Makarska (<5), and in Rovinj (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over two hundred times, the first time 1749 in source 18th Century Census.