In Croatia, Krnulc families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area.
Prevalence
Only a few people with faimily name Krnulc live in Croatia today, in three households only. They are located in two Croatian counties, in one city and another small place , mostly in Zagreb (<10) and Vir in Nin area (<5).
Outside Croatia
Family name Krnulc is present in this form only in Croatia.