In Croatia, Šešlek families are Croats (from Klanjec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Klanjec area.
Prevalence
About 40 people with faimily name Šešlek live in Croatia today, in 15 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in only four naselja i to in Zagreb (35), Sesvete (<5), Sisak (<5), and in Velika Gorica (<5).
Outside Croatia
Family name Šešlek is present in this form only in Croatia.