In Croatia, Oljačić families are Croats (from Banja Luka Region (Bosnia) ). In the past century, relatively most of Croatian residents bearing this family name were born in Banja Luka Region, Bosnia (Banja Luka area) and in Sisak.
Prevalence
About 30 people with faimily name Oljačić live in Croatia today, in 12 households. They are only located in in 6 Croatian cities and 5 other places, mostly in Petrinja (<10), Kutina (<10), Ponikvari in Glina area (<10), Sisak (<5), and in Suhopolje in Virovitica area (<5).