In Croatia, Rajek families are predominantly Croats (from Daruvar area ), rarely Czechs (from Daruvar ). In the past century, relatively most of Croatian residents bearing this family name were born in Daruvar and Pakrac.
Prevalence
About 20 people with faimily name Rajek live in Croatia today, in 10 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in only five naselja i to in Sirac in Daruvar area (<10), Daruvar (<10), Miljanovac in Daruvar area (<5), Doljani (<5), and in Daruvarski Vinogradi (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1933 in source Emigration Commission Zagreb.