About 80 people with faimily name Martinjaš live in Croatia today, in 40 households. There were 50 of them in the middle of the past century, and their number increased by 40 percent. They are located in four Croatian counties, in 6 cities and 11 other places, mostly in Podturen in Mursko Sredisce area (20), Cakovec (15), Sivica in Mursko Sredisce area (<10), Karlovac (<10), and in Pretetinec in Cakovec area (<10).
Outside Croatia
Family name Martinjaš is present in this form only in Croatia.
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.