In Croatia, Mateak families are Croats (from Zagreb ).
Prevalence
About 30 people with faimily name Mateak live in Croatia today, in one household only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in one Croatian city only, in Zagreb (<5).
Outside Croatia
Family name Mateak is present in 6 countries on three continents. The family name "Mateak " is used by few 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 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.