In Croatia, Mikolavčić families are generally Croats (from Buzet ), very rarely Macedonians (from Zagreb ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Buzet and Zagreb.
Prevalence
About 20 people with faimily name Mikolavčić live in Croatia today, in 12 households. There were 40 of them in the middle of the past century, and their number halved. They are located in only five naselja i to in Zagreb (<10), Buzet (<5), Sveti Ivan in Buzet area (<5), Pula (<5), and in Roc (<5).
Outside Croatia
Family name Mikolavčić is present in two countries.