In Croatia, Poštenjak families are Croats (from Imotsko ). In the past century, relatively most of Croatian residents bearing this family name were born in Split and Imotsko.
Prevalence
About 40 people with faimily name Poštenjak live in Croatia today, in 19 households. There were 40 of them in the middle of the past century, and their number remains constant. They are only located in in 6 Croatian cities and threee other places, mostly in Imotski (15), Split (15), Zagreb (<10), Metkovic (<5), and in Okrug Gornji on the Island of Ciovo (<5).
Outside Croatia
Family name Poštenjak (including: Postenjak , Postenjac ) is present in three countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.