In Croatia, Grab families are mainly Serbs, less frequently Croats (from Hrvatska Kostajnica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Bosanian Posavina (Bosanski Novi area) and in Zagreb. In Jošava in Bosanian Posavina every ninth inhabitant had the family name Grab.
Prevalence
About 20 people with faimily name Grab live in Croatia today, in 6 households. They are located in only threee naselja i to in Zagreb (<5), Petrinjci in Hrvatska Kostajnica area (<5), and in Sisak (<5).