In Croatia, Biff families are Croats (from Klanjec area ). In the past century, relatively most of Croatian residents bearing this family name were born in Slovenia.
Prevalence
Only a few people with faimily name Biff live in Croatia today, in two households only. They are located in only threee Croatian places: in Kraljevec na Sutli in Zabok area (<5), and in Rozga (<5) and Dubravica (<5) in Klanjec area.
Outside Croatia
Family name Biff is present in three countries on two continents. "Bieff " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.