Iskra families are frequently Croats and they are mostly from Opatija area , rarely Slovenes (from Slovenia ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Delnice area. In Lisac in Opatija area every fifth inhabitant had the family name Iskra.
Prevalence
About 360 people with faimily name Iskra live in Croatia today, in 170 households. There were 460 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 21 cities and 43 other places, mostly in Rijeka (65), Zagreb (40), in Lisac (25) and Klana (20) in Opatija area, and in Rovinj (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.