In Croatia, Čepak families are Croats by relative majority (from Buje ), rarely Serbs, and . In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia and in Buje. In Oskoruš in Buje every eighth inhabitant had the family name Čepak.
Prevalence
Only a few people with faimily name Čepak live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only two Croatian places: in Buje (<10) and Kavran in Pula area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.