In Croatia, Mostečak families are almost entirely Croats (from Lepoglava area ), barely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Lepoglava area and in Varazdin.
Prevalence
About 60 people with faimily name Mostečak live in Croatia today, in 20 households. There were 90 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 6 Croatian counties, in 9 cities and 9 other places, mostly in Zagreb (15), Benkovec in Lepoglava area (10), Osijek (<10), Ivanec (<5), and in Varazdin (<5).
Outside Croatia
Family name Mostečak is present in three countries on two continents. The family name "Mostecak " is used by few people in France and 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 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.