In Croatia, Biserko families are predominantly Serbs, rarely Croats (also from Knin ). In the past century, relatively most of Croatian residents bearing this family name were born in Knin and in Serbia.
Prevalence
About 20 people with faimily name Biserko live in Croatia today, in 14 households. There were 40 of them in the middle of the past century, and their number halved. They are located in only five naselja i to in Knin (15), Sveti Kriz Zacretje in Zabok area (<5), Sutomiscica on the Island of Ugljan (<5), Zagreb (<5), and in Rijeka (<5).
Outside Croatia
Family name Biserko is present in three countries on two continents.