In Croatia, Šulek families are almost entirely Croats (from Zupanja area ), barely Montenegrins (from Zagreb ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Oroslavje.
Prevalence
About 50 people with faimily name Šulek live in Croatia today, in 20 households. There were 70 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 6 Croatian counties and 7 other places, mostly in Zagreb (25), Voloder in Kutina area (<10), Cerna in Zupanja area (<10), Oroslavje (<10), and in Vinkovci (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.