In Croatia, Tesko families are Croats (from Osijek area ). In the past century, relatively most of Croatian residents bearing this family name were born in Osijek area and in Osijek.
Prevalence
Only a few people with faimily name Tesko live in Croatia today, in 6 households. There were 10 of them in the middle of the past century, and their number remains constant. They are located in three Croatian cities only: in Zagreb (<5), Zadar (<5), and in Velika Gorica (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.