In Croatia, Slonka families are predominantly Croats (from Karlovac ), rarely Slovaks (from Ilok ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and in Backa, Vojvodina.
Prevalence
About 10 people with faimily name Slonka live in Croatia today, in three households only. They are located in only four naselja i to in Knez Gorica (<10), Pula (<5), Ilok (<5), and in Medulin in Pula area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.