Šuljak families are Croats and they are mostly from Drnis. In the past century, relatively most of Croatian residents bearing this family name were born in Drnis and Sibenik.
Prevalence
About 230 people with faimily name Šuljak live in Croatia today, in 80 households. There were 140 of them in the middle of the past century, and their number increased by 60 percent. They are located in the most of Croatian counties, in 19 cities and 19 other places, mostly in Zagreb (35), Mocici in Dubrovnik area (25), Drnis (20), Kastel Kambelovac (15), and in Radonic (15).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.