Šimleša families are Croats and they are mostly from Sinj. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and Split.
Prevalence
About 270 people with faimily name Šimleša live in Croatia today, in 100 households. There were 160 of them in the middle of the past century, and their number increased by 70 percent. They are located in the most of Croatian counties, in 16 cities and 15 other places, mostly in Bajagic (90), Split (55), Sinj (30), Zagreb (15), and in Kastel Stari (15).
Outside Croatia
At least four families with this surname emigrated from Croatia to: the United States (1), Sweden (1), Australia (1), and to Germany (1). Family name Šimleša is present in five countries on four continents. The family name "Simlesa " is used by some 60 people in Australia and small number in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1938 in source Phone Book - Zagreb 1938.