In Croatia, Spaček families are generally Croats (from Ilok area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and Zagreb.
Prevalence
About 10 people with faimily name Spaček live in Croatia today, in 6 households. There were 20 of them in the middle of the past century, and their number halved. They are located in three Croatian cities only: in Zagreb (<10), Osijek (<5), and in Krapina (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.