In Croatia, Buc families are Croats (from Novska ).
Prevalence
Only a few people with faimily name Buc live in Croatia today, in one household only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in two Croatian counties, in one city and another small place , mostly in Novska (<5) and Gradiste in Zupanja area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1942 in source Phone Directory of the Independent State of Croatia 1942.