About 20 people with faimily name Sirol live in Croatia today, in households. There were 30 of them in the middle of the past century, and their number decreased by 40 percent. They are located in only one small Croatian place, in Gracisce in Pazin area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1923 in source Emigration Commission Zagreb.