In Croatia, Šum families are Croats (from Dugo Selo area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Osijek.
Prevalence
Only a few people with faimily name Šum live in Croatia today, in one household only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only two Croatian places: in Lupoglav in Dugo Selo area (<10) and Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.