Šajnić families are Croats and they are mostly from Sisak. In the past century, relatively most of Croatian residents bearing this family name were born in Sisak and Zagreb. In Veliko Svinjičko in Sisak every ninth inhabitant had the family name Šajnić.
Prevalence
About 80 people with faimily name Šajnić live in Croatia today, in 40 households. There were 40 of them in the middle of the past century, and their number doubled. They are located in 6 Croatian counties, in 8 cities and 10 other places, mostly in Veliko Svinjicko (30), Zagreb (15), Sisak (<10), Velika Gorica (<10), and in Bestovje in Samobor area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.