In Croatia, Sidlik families are generally Croats (from Bosnian Posavina ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Derventa area).
Prevalence
About 10 people with faimily name Sidlik live in Croatia today, in 6 households. They are located in only five naselja i to in Tenja (<10), Pozega (<5), Vranesevci in Slatina area (<5), Osijek (<5), and in Brestovac in Pozega area (<5).