Zemljak families are Croats and they are mostly from Valpova. In the past century, relatively most of Croatian residents bearing this family name were born in Varazdin and Zagreb.
Prevalence
About 160 people with faimily name Zemljak live in Croatia today, in 60 households. There were 190 of them in the middle of the past century, and their number decreased by 20 percent. They are located in the most of Croatian counties, in 18 cities and 15 other places, mostly in Zagreb (30), Podevcevo (25), Valpovo (20), Osijek (10), and in Turcin in Varazdin area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.