In Croatia, Wolff families are Croats (from Dubrovnik ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb.
Prevalence
About 20 people with faimily name Wolff live in Croatia today, in 8 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in two Croatian cities only, in Zagreb (<10) and Dubrovnik (<10).
Outside Croatia
Family name Wolff (including: Woolff , Wollff ) is present in 100 countries worldwide. The family name "Wolff " is used by some 40000 people in Germany , about 30000 in the United States , and some 10000 people in Brazil.
In the sources analysed in the project Acta Croatica so far, the name is mentioned about one hundred times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.