In Croatia, Seljak families are Croats (from Opatija ). In the past century, relatively most of Croatian residents bearing this family name were born in Opatija and in Opatija area.
Prevalence
Only a few people with faimily name Seljak live in Croatia today, in two households only. There were 30 of them in the middle of the past century, and their number decreased significantly. They are only located in in one Croatian city and two other places, mostly in Opatija (<10), and in Matulji (<5) and Moscenicka Draga (<5) in Opatija area.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.