In Croatia, Gajnik families are Croats (from Cakovec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Cakovec and in Cakovec area.
Prevalence
About 20 people with faimily name Gajnik live in Croatia today, in 8 households. There were 30 of them in the middle of the past century, and their number decreased by 40 percent. They are located in threee Croatian counties, threee cities and threee other places, mostly in Cakovec (<10), Orehovica in Cakovec area (<10), Pribislavec (<10), Zapresic (<5), and in Podbrest in Cakovec area (<5).
Outside Croatia
Family name Gajnik (including: Gaynik , Gaynych ) is present in 7 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1943 in source Directorium ARCHI-DIOECESI ZAGREBIENSI.