In Croatia, Leustek families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
Only a few people with faimily name Leustek live in Croatia today, in two households only. There were 20 of them in the middle of the past century, and their number decreased significantly. They are located in one Croatian city only, in Zagreb (<5).
Outside Croatia
Family name Leustek is present in three countries on three continents. The family name "Leustek " is used by some 80 people in the United States and small number in Egypt.
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.