In Croatia, Grljak families are Croats (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Virovitica.
Prevalence
About 20 people with faimily name Grljak live in Croatia today, in 10 households. There were 30 of them in the middle of the past century, and their number decreased by 30 percent. They are located in only five naselja i to in Sesvete (<10), Vugrovec Gornji (<5), Vugrovec Donji (<5), Zlebina in Virovitica area (<5), and in Bolc in Cazma area (<5).
Outside Croatia
Family name Grljak (including: Gerlyak , Gerlyakh and Grlyak ) is present in five countries on two continents.