In Croatia, Šešić families are predominantly Croats (from Bjelovar ), rarely Serbs (from Banja Luka Region (Bosnia) ). In the past century, relatively most of Croatian residents bearing this family name were born in Bjelovar and in Banja Luka Region, Bosnia (Banja Luka area).
Prevalence
About 30 people with faimily name Šešić live in Croatia today, in 15 households. There were 90 of them in the middle of the past century, and their number decreased significantly. They are located and 6 other Croatian places, mostly in Split (<10), Bjelovar (<10), Zagreb (<10), Belovar (<10), and in Stancici (<5).
Outside Croatia
Family name Šešić (including: Sesic , Sesich ) is present in 11 countries on two continents. The family name "Sesic " is used by some 70 people in the United States. "Sesich " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.